Refereed, Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, Distinguishing the XUV-induced Coulomb explosion dynamics of iodobenzene using covariance analysis, Tiffany Walmsley; Felix Allum; James R Harries; Yoshiaki Kumagai; Suzanne Lim; Joseph McManus; Kiyonobu Nagaya; Mathew Britton; Mark Brouard; Philip Bucksbaum; Mizuho Fushitani; Ian Gabalski; Tatsuo Gejo; Paul Hockett; Andrew J Howard; Hiroshi Iwayama; Edwin Kukk; Chow-shing Lam; Russell S Minns; Akinobu Niozu; Sekito Nishimuro; Johannes Niskanen; Shigeki Owada; Weronika O Razmus; Daniel Rolles; James Somper; Kiyoshi Ueda; James Unwin; Shin-ichi Wada; Joanne L Woodhouse; Ruaridh Forbes; Michael Burt; Emily M Warne, Abstract

The primary and secondary fragmentation dynamics of iodobenzene following its ionization at 120 eV were determined using three-dimensional velocity map imaging and covariance analysis. Site-selective iodine 4d ionization was used to populate a range of excited polycationic parent states, which primarily broke apart at the carbon-iodine bond to produce I⁺ with phenyl or phenyl-like cations (C _n H or C _n H , with n  =  1 – 6 and x  =  1 – 5). The molecular products were produced with varying degrees of internal excitation and dehydrogenation, leading to stable and unstable outcomes. This further allowed the secondary dynamics of intermediates to be distinguished using native-frame covariance analysis, which isolated these processes in their own centre-of-mass reference frames. The mass resolution of the imaging mass spectrometer used for these measurements enabled the primary and secondary reaction channels to be specified at the level of individual hydrogen atoms, demonstrating the ability of covariance analysis to comprehensively measure the competing fragmentation channels of aryl cations, including those involving intermediate steps., 25 Oct. 2024, 57, 23, 235101, 235101, Scientific journal, 10.1088/1361-6455/ad8799

Refereed, ACS Physical Chemistry Au, American Chemical Society (ACS), Time-Resolved Probing of the Iodobenzene C-Band Using XUV-Induced Electron Transfer Dynamics, James Unwin; Weronika O. Razmus; Felix Allum; James R. Harries; Yoshiaki Kumagai; Kiyonobu Nagaya; Mathew Britton; Mark Brouard; Philip Bucksbaum; Mizuho Fushitani; Ian Gabalski; Tatsuo Gejo; Paul Hockett; Andrew J. Howard; Hiroshi Iwayama; Edwin Kukk; Chow-shing Lam; Joseph McManus; Russell S. Minns; Akinobu Niozu; Sekito Nishimuro; Johannes Niskanen; Shigeki Owada; James D. Pickering; Daniel Rolles; James Somper; Kiyoshi Ueda; Shin-ichi Wada; Tiffany Walmsley; Joanne L. Woodhouse; Ruaridh Forbes; Michael Burt; Emily M. Warne, 10 Aug. 2024, Scientific journal, 10.1021/acsphyschemau.4c00036

Refereed, New Journal of Physics, IOP Publishing, Double diffraction imaging of x-ray induced structural dynamics in single free nanoparticles, M Sauppe; T Bischoff; C Bomme; C Bostedt; A Colombo; B Erk; T Feigl; L Flückiger; T Gorkhover; A Heilrath; K Kolatzki; Y Kumagai; B Langbehn; J P Müller; C Passow; D Ramm; D Rolles; D Rompotis; J Schäfer-Zimmermann; B Senfftleben; R Treusch; A Ulmer; J Zimbalski; T Möller; D Rupp, Abstract

Because of their high photon flux, x-ray free-electron lasers (FEL) allow to resolve the structure of individual nanoparticles via coherent diffractive imaging (CDI) within a single x-ray pulse. Since the inevitable rapid destruction of the sample limits the achievable resolution, a thorough understanding of the spatiotemporal evolution of matter on the nanoscale following the irradiation is crucial. We present a technique to track x-ray induced structural changes in time and space by recording two consecutive diffraction patterns of the same single, free-flying nanoparticle, acquired separately on two large-area detectors opposite to each other, thus examining both the initial and evolved particle structure. We demonstrate the method at the extreme ultraviolet (XUV) and soft x-ray Free-electron LASer in Hamburg (FLASH), investigating xenon clusters as model systems. By splitting a single XUV pulse, two diffraction patterns from the same particle can be obtained. For focus intensities of about  W cm⁻² we observe still largely intact clusters even at the longest delays of up to 650 picoseconds of the second pulse, indicating that in the highly absorbing systems the damage remains confined to one side of the cluster. Instead, in case of five times higher flux, the diffraction patterns show clear signatures of disintegration, namely increased diameters and density fluctuations in the fragmenting clusters. Future improvements to the accessible range of dynamics and time resolution of the approach are discussed., 12 Jul. 2024, 26, 7, 073019, 073019, Scientific journal, 10.1088/1367-2630/ad5d84

Refereed, The Journal of Physical Chemistry A, The Role of Momentum Partitioning in Covariance Ion Imaging Analysis, Tiffany Walmsley; Joseph W. McManus; Yoshiaki Kumagai; Kiyonobu Nagaya; James Harries; Hiroshi Iwayama; Michael N. R. Ashfold; Mathew Britton; Philip H. Bucksbaum; Briony Downes-Ward; Taran Driver; David Heathcote; Paul Hockett; Andrew J. Howard; Jason W. L. Lee; Yusong Liu; Edwin Kukk; Dennis Milesevic; Russell S. Minns; Akinobu Niozu; Johannes Niskanen; Andrew J. Orr-Ewing; Shigeki Owada; Patrick A. Robertson; Daniel Rolles; Artem Rudenko; Kiyoshi Ueda; James Unwin; Claire Vallance; Mark Brouard; Michael Burt; Felix Allum; Ruaridh Forbes, 06 Jun. 2024, Scientific journal, 10.1021/acs.jpca.4c00999

Refereed, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier BV, Rainbow scattering pattern of fast ions by graphene sheet, N. Watanabe; M. Otsuka; Y. Kumagai; K. Ishii, May 2024, 553, 165380, 165380, Scientific journal, 10.1016/j.nimb.2024.165380

Refereed, Physical Chemistry Chemical Physics, Exploring the ultrafast and isomer-dependent photodissociation of iodothiophenes via site-selective ionization, Weronika O. Razmus; Felix Allum; James Harries; Yoshiaki Kumagai; Kiyonobu Nagaya; Surjendu Bhattacharyya; Mathew Britton; Mark Brouard; Philip H. Bucksbaum; Kieran Cheung; Stuart W. Crane; Mizuho Fushitani; Ian Gabalski; Tatsuo Gejo; Aaron Ghrist; David Heathcote; Yasumasa Hikosaka; Akiyoshi Hishikawa; Paul Hockett; Ellen Jones; Edwin Kukk; Hiroshi Iwayama; Huynh V. S. Lam; Joseph W. McManus; Dennis Milesevic; Jochen Mikosch; Shinichirou Minemoto; Akinobu Niozu; Andrew J. Orr-Ewing; Shigeki Owada; Daniel Rolles; Artem Rudenko; Dave Townsend; Kiyoshi Ueda; James Unwin; Claire Vallance; Anbu Venkatachalam; Shin-ichi Wada; Tiffany Walmsley; Emily M. Warne; Joanne L. Woodhouse; Michael Burt; Michael N. R. Ashfold; Russell S. Minns; Ruaridh Forbes, Apr. 2024, Scientific journal, 10.1039/D3CP06079A

Refereed, Journal of the American Chemical Society, American Chemical Society (ACS), Tracking Cavity Formation in Electron Solvation: Insights from X-ray Spectroscopy and Theory, Arturo Sopena Moros; Shuai Li; Kai Li; Gilles Doumy; Stephen H. Southworth; Christopher Otolski; Richard D. Schaller; Yoshiaki Kumagai; Jan-Erik Rubensson; Marc Simon; Georgi Dakovski; Kristjan Kunnus; Joseph S. Robinson; Christina Y. Hampton; David J. Hoffman; Jake Koralek; Zhi-Heng Loh; Robin Santra; Ludger Inhester; Linda Young, 25 Jan. 2024, Scientific journal, 10.1021/jacs.3c11857

Refereed, Structural Dynamics, AIP Publishing, Disentangling the evolution of electrons and holes in photoexcited ZnO nanoparticles, Christopher J. Milne; Natalia Nagornova; Thomas Pope; Hui-Yuan Chen; Thomas Rossi; Jakub Szlachetko; Wojciech Gawelda; Alexander Britz; Tim B. van Driel; Leonardo Sala; Simon Ebner; Tetsuo Katayama; Stephen H. Southworth; Gilles Doumy; Anne Marie March; C. Stefan Lehmann; Melanie Mucke; Denys Iablonskyi; Yoshiaki Kumagai; Gregor Knopp; Koji Motomura; Tadashi Togashi; Shigeki Owada; Makina Yabashi; Martin M. Nielsen; Marek Pajek; Kiyoshi Ueda; Rafael Abela; Thomas J. Penfold; Majed Chergui, The evolution of charge carriers in photoexcited room temperature ZnO nanoparticles in solution is investigated using ultrafast ultraviolet photoluminescence spectroscopy, ultrafast Zn K-edge absorption spectroscopy, and ab initio molecular dynamics (MD) simulations. The photoluminescence is excited at 4.66 eV, well above the band edge, and shows that electron cooling in the conduction band and exciton formation occur in <500 fs, in excellent agreement with theoretical predictions. The x-ray absorption measurements, obtained upon excitation close to the band edge at 3.49 eV, are sensitive to the migration and trapping of holes. They reveal that the 2 ps transient largely reproduces the previously reported transient obtained at 100 ps time delay in synchrotron studies. In addition, the x-ray absorption signal is found to rise in ∼1.4 ps, which we attribute to the diffusion of holes through the lattice prior to their trapping at singly charged oxygen vacancies. Indeed, the MD simulations show that impulsive trapping of holes induces an ultrafast expansion of the cage of Zn atoms in <200 fs, followed by an oscillatory response at a frequency of ∼100 cm−1, which corresponds to a phonon mode of the system involving the Zn sub-lattice., 01 Nov. 2023, 10, 6, Scientific journal, 10.1063/4.0000204

Refereed, Physical Review A, American Physical Society (APS), Direct momentum imaging of charge transfer following site-selective ionization, Felix Allum; Yoshiaki Kumagai; Kiyonobu Nagaya; James Harries; Hiroshi Iwayama; Mathew Britton; Philip H. Bucksbaum; Michael Burt; Mark Brouard; Briony Downes-Ward; Taran Driver; David Heathcote; Paul Hockett; Andrew J. Howard; Jason W. L. Lee; Yusong Liu; Edwin Kukk; Joseph W. McManus; Dennis Milsesevic; Akinobu Niozu; Johannes Niskanen; Andrew J. Orr-Ewing; Shigeki Owada; Patrick A. Robertson; Artem Rudenko; Kiyoshi Ueda; James Unwin; Claire Vallance; Tiffany Walmsley; Russell S. Minns; Daniel Rolles; Michael N. R. Ashfold; Ruaridh Forbes, 23 Oct. 2023, 108, 4, Scientific journal, 10.1103/physreva.108.043113

Refereed, May 2023, 20, 3, 36, 55, Scientific journal, 10.50847/collision.20.3_36

Refereed, Apr. 2023, 115, 51, 58, Scientific journal

Refereed, Applied Sciences, MDPI AG, Ionization of Xenon Clusters by a Hard X-ray Laser Pulse, Yoshiaki Kumagai; Weiqing Xu; Kazuki Asa; Toshiyuki Hiraki Nishiyama; Koji Motomura; Shin-ichi Wada; Denys Iablonskyi; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Hironobu Fukuzawa; Kiyonobu Nagaya; Kiyoshi Ueda, Ultrashort pulse X-ray free electron lasers (XFFLs) provided us with an unprecedented regime of X-ray intensities, revolutionizing ultrafast structure determination and paving the way to the novel field of non-linear X-ray optics. While pioneering studies revealed the formation of a nanoplasma following the interaction of an XFEL pulse with nanometer-scale matter, nanoplasma formation and disintegration processes are not completely understood, and the behavior of trapped electrons in the electrostatic potential of highly charged species is yet to be decrypted. Here we report the behavior of the nanoplasma created by a hard X-ray pulse interacting with xenon clusters by using electron and ion spectroscopy. To obtain a deep insight into the formation and disintegration of XFEL-ignited nanoplasma, we studied the XFEL-intensity and cluster-size dependencies of the ionization dynamics. We also present the time-resolved data obtained by a near-infrared (NIR) probe pulse in order to experimentally track the time evolution of plasma electrons distributed in the XFEL-ignited nanoplasma. We observed an unexpected time delay dependence of the ion yield enhancement due to the NIR pulse heating, which demonstrates that the plasma electrons within the XFEL-ignited nanoplasma are inhomogeneously distributed in space., 08 Feb. 2023, 13, 4, 2176, 2176, Scientific journal, 10.3390/app13042176

Refereed, Physical Chemistry Chemical Physics, Royal Society of Chemistry (RSC), Disentangling sequential and concerted fragmentations of molecular polycations with covariant native frame analysis, Joseph W. McManus; Tiffany Walmsley; Kiyonobu Nagaya; James R. Harries; Yoshiaki Kumagai; Hiroshi Iwayama; Michael N.R. Ashfold; Mathew Britton; Philip H. Bucksbaum; Briony Downes-Ward; Taran Driver; David Heathcote; Paul Hockett; Andrew J. Howard; Edwin Kukk; Jason W. L. Lee; Yusong Liu; Dennis Milesevic; Russell S. Minns; Akinobu Niozu; Johannes Niskanen; Andrew J. Orr-Ewing; Shigeki Owada; Daniel Rolles; Patrick A. Robertson; Artem Rudenko; Kiyoshi Ueda; James Unwin; Claire Vallance; Michael Burt; Mark Brouard; Ruaridh Forbes; Felix Allum, Using covariance analysis methods, we study the fragmentation dynamics of multiply ionized 1- and 2-iodopropane. Signatures of isomer-specific nuclear motion occurring during sequential fragmentation pathways are identified., Sep. 2022, Scientific journal, 10.1039/d2cp03029b

Refereed, Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Crystallization kinetics of atomic crystals revealed by a single-shot and single-particle X-ray diffraction experiment, Akinobu Niozu; Yoshiaki Kumagai; Toshiyuki Nishiyama Hiraki; Hironobu Fukuzawa; Koji Motomura; Maximilian Bucher; Kazuki Asa; Yuhiro Sato; Yuta Ito; Daehyun You; Taishi Ono; Yiwen Li; Edwin Kukk; Catalin Miron; Liviu Neagu; Carlo Callegari; Michele Di Fraia; Giorgio Rossi; Davide Emilio Galli; Tommaso Pincelli; Alessandro Colombo; Shigeki Owada; Kensuke Tono; Takashi Kameshima; Yasumasa Joti; Tetsuo Katayama; Tadashi Togashi; Makina Yabashi; Kazuhiro Matsuda; Christoph Bostedt; Kiyoshi Ueda; Kiyonobu Nagaya, Crystallization is a fundamental natural phenomenon and the ubiquitous physical process in materials science for the design of new materials. So far, experimental observations of the structural dynamics in crystallization have been mostly restricted to slow dynamics. We present here an exclusive way to explore the dynamics of crystallization in highly controlled conditions (i.e., in the absence of impurities acting as seeds of the crystallites) as it occurs in vacuum. We have measured the early formation stage of solid Xe nanoparticles nucleated in an expanding supercooled Xe jet by means of an X-ray diffraction experiment with 10-fs X-ray free-electron laser (XFEL) pulses. We found that the structure of Xe nanoparticles is not pure face-centered cubic (fcc), the expected stable phase, but a mixture of fcc and randomly stacked hexagonal close-packed (rhcp) structures. Furthermore, we identified the instantaneous coexistence of the comparably sized fcc and rhcp domains in single Xe nanoparticles. The observations are explained by the scenario of structural aging, in which the nanoparticles initially crystallize in the highly stacking-disordered rhcp phase and the structure later forms the stable fcc phase. The results are reminiscent of analogous observations in hard-sphere systems, indicating the universal role of the stacking-disordered phase in nucleation., 21 Dec. 2021, 118, 51, e2111747118, e2111747118, Scientific journal, 10.1073/pnas.2111747118

Refereed, Physical Review X, American Physical Society ({APS}), Correlation-Driven Transient Hole Dynamics Resolved in Space and Time in the Isopropanol Molecule, T. Barillot; O. Alex; er; B. Cooper; T. Driver; D. Garratt; S. Li; A. Al Haddad; A. Sanchez-Gonzalez; M. Ag{\aa}ker; C. Arrell; M.{\hspace{0.167em } }J. Bearpark; N. Berrah; C. Bostedt; J. Bozek; C. Brahms; P.{\hspace{0.167em } }H. Bucksbaum; A. Clark; G. Doumy; R. Feifel; L.{\hspace{0.167em } }J. Frasinski; S. Jarosch; A.{\hspace{0.167em } }S. Johnson; L. Kjellsson; P. Koloren{\v{c } }; Y. Kumagai; E.{\hspace{0.167em } }W. Larsen; P. Matia-Hern; o; M. Robb; J.-E. Rubensson; M. Ruberti; C. Sathe; R.{\hspace{0.167em } }J. Squibb; A. Tan; J.{\hspace{0.167em } }W.{\hspace{0.167em } }G. Tisch; M. Vacher; D.{\hspace{0.167em } }J. Walke; T.{\hspace{0.167em } }J.{\hspace{0.167em } }A. Wolf; D. Wood; V. Zhaunerchyk; P. Walter; T. Osipov; A. Marinelli; T.{\hspace{0.167em } }J. Maxwell; R. Coffee; A.{\hspace{0.167em } }A. Lutman; V. Averbukh; K. Ueda; J.{\hspace{0.167em } }P. Cryan; J.{\hspace{0.167em } }P. Marangos, 01 Sep. 2021, 11, 3, 031048, Scientific journal, 10.1103/physrevx.11.031048

Refereed, Physical Review X, American Physical Society (APS), Relation between Inner Structural Dynamics and Ion Dynamics of Laser-Heated Nanoparticles, Akinobu Niozu; Yoshiaki Kumagai; Hironobu Fukuzawa; Naomichi Yokono; Daehyun You; Shu Saito; Yu Luo; Edwin Kukk; Claudio Cirelli; Jonas Rist; Isabel Vela-Pérez; Takashi Kameshima; Yasumasa Joti; Koji Motomura; Tadashi Togashi; Shigeki Owada; Tetsuo Katayama; Kensuke Tono; Makina Yabashi; Linda Young; Kazuhiro Matsuda; Christoph Bostedt; Kiyoshi Ueda; Kiyonobu Nagaya, 30 Aug. 2021, 11, 3, 031046, Scientific journal, 10.1103/PhysRevX.11.031046

Refereed, International Journal of Radiation Biology, Informa UK Limited, X-ray induced luminescence spectroscopy for DNA damaging intermediates aided by a monochromatic synchrotron radiation, Yusaku Terao; Yoshiaki Kumagai; Issei Suzuki; Takahiro Tsuchiya; Masatoshi Ukai; Akinari Yokoya; Kentaro Fujii; Yoshihiro Fukuda; Yuji Saitoh, 23 Aug. 2021, 99, 1, 89, 94, Scientific journal, 10.1080/09553002.2021.1967506

Refereed, Journal of the American Chemical Society, American Chemical Society (ACS), Quantifying Photoinduced Polaronic Distortions in Inorganic Lead Halide Perovskite Nanocrystals, Oliviero Cannelli; Nicola Colonna; Michele Puppin; Thomas C. Rossi; Dominik Kinschel; Ludmila M. D. Leroy; Janina Löffler; James M. Budarz; Anne Marie March; Gilles Doumy; Andre Al Haddad; Ming-Feng Tu; Yoshiaki Kumagai; Donald Walko; Grigory Smolentsev; Franziska Krieg; Simon C. Boehme; Maksym V. Kovalenko; Majed Chergui; Giulia F. Mancini, 23 Jun. 2021, 143, 24, 9048, 9059, Scientific journal, 10.1021/jacs.1c02403

Refereed, Journal of Physics B: Atomic, Molecular and Optical Physics, {IOP} Publishing, Suppression of thermal nanoplasma emission in clusters strongly ionized by hard x-rays, Yoshiaki Kumagai; Zoltan Jurek; Weiqing Xu; Vikrant Saxena; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Shin-ichi Wada; Yuta Ito; Tsukasa Takanashi; Shuhei Yamada; Yuta Sakakibara; Toshiyuki Nishiyama Hiraki; Takayuki Umemoto; Minna Patanen; John D Bozek; Ioan Dancus; Mihail Cernaianu; Catalin Miron; Tobias Bauer; Melanie Mucke; Edwin Kukk; Shigeki Owada; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Sang-Kil Son; Beata Ziaja; Robin Santra; Kiyoshi Ueda, 17 Feb. 2021, 54, 4, 044001, 044001, Scientific journal, 10.1088/1361-6455/abd878

Refereed, Journal of Physics Communications, {IOP} Publishing, Surface plasma resonance in Xe clusters studied by EUV pump-NIR probe experiments, K Nagaya; T Sakai; T Nishiyama Hiraki; S Yase; K Matsunami; K Asa; H Fukuzawa; K Motomura; Y Kumagai; W Q Xu; S Wada; H Hayashita; N Saito; M Nagasono; T Togashi; M Yabashi; K Ueda, 01 Jan. 2021, 5, 1, 015014, 015014, Scientific journal, 10.1088/2399-6528/abdafa

Refereed, Physical Review Letters, American Physical Society (APS), Resonant Inelastic X-Ray Scattering Reveals Hidden Local Transitions of the Aqueous OH Radical, Kjellsson, L.; N; a, K.D.; Rubensson, J.-E.; Doumy, G.; Southworth, S.H.; Ho, P.J.; March, A.M.; Al Haddad, A.; Kumagai, Y.; Tu, M.-F.; Schaller, R.D.; Schaller, R.D.; Debnath, T.; Bin Mohd Yusof, M.S.; Arnold, C.; Arnold, C.; Arnold, C.; Schlotter, W.F.; Moeller, S.; Coslovich, G.; Koralek, J.D.; Minitti, M.P.; Vidal, M.L.; Simon, M.; Santra, R.; Santra, R.; Santra, R.; Loh, Z.-H.; Coriani, S.; Krylov, A.I.; Young, L.; Young, L., 12 Jun. 2020, 124, 23, 236001, Scientific journal, 10.1103/PhysRevLett.124.236001

Journal of Physics: Conference Series, Institute of Physics Publishing, Distribution of dipole oscillator strengths for the formation of excited hydrogen atom from C2H2, Y. Kumagai; T. Odagirit; M. Nakano; I. H. Suzuki; K. Hosaka; M. Kitajima; N. Kouchi, Synopsis Dipole oscillator strengths for the formation of excited hydrogen atom from C2H2 were measured to investigate formation and decay of molecular superexcited states. It seems that non-adiabatic transition plays an important role in the formations of the hot hydrogen atom., 11 Jun. 2020, 1412, 14, International conference proceedings, 10.1088/1742-6596/1412/14/142020

Refereed, Physical Review Letters, Angular Momentum in Rotating Superfluid Droplets, Sean M. O. O’Connell; Rico Mayro P. Tanyag; Deepak Verma; Charles Bernando; Weiwu Pang; Camila Bacellar; Catherine A. Saladrigas; Johannes Mahl; Benjamin W. Toulson; Yoshiaki Kumagai; Peter Walter; Francesco Ancilotto; Manuel Barranco; Marti Pi; Christoph Bostedt; Oliver Gessner; Andrey F. Vilesov, 26 May 2020, 124, 21, Scientific journal, 10.1103/PhysRevLett.124.215301

Refereed, IUCrJ, Characterizing crystalline defects in single nanoparticles from angular correlations of single-shot diffracted X-rays., Akinobu Niozu; Yoshiaki Kumagai; Toshiyuki Nishiyama; Hironobu Fukuzawa; Koji Motomura; Maximilian Bucher; Kazuki Asa; Yuhiro Sato; Yuta Ito; Tsukasa Takanashi; Daehyun You; Taishi Ono; Yiwen Li; Edwin Kukk; Catalin Miron; Liviu Neagu; Carlo Callegari; Michele Di Fraia; Giorgio Rossi; Davide E Galli; Tommaso Pincelli; Alessandro Colombo; Shigeki Owada; Kensuke Tono; Takashi Kameshima; Yasumasa Joti; Tetsuo Katayama; Tadashi Togashi; Makina Yabashi; Kazuhiro Matsuda; Kiyonobu Nagaya; Christoph Bostedt; Kiyoshi Ueda, Characterizing and controlling the uniformity of nanoparticles is crucial for their application in science and technology because crystalline defects in the nanoparticles strongly affect their unique properties. Recently, ultra-short and ultra-bright X-ray pulses provided by X-ray free-electron lasers (XFELs) opened up the possibility of structure determination of nanometre-scale matter with Å spatial resolution. However, it is often difficult to reconstruct the 3D structural information from single-shot X-ray diffraction patterns owing to the random orientation of the particles. This report proposes an analysis approach for characterizing defects in nanoparticles using wide-angle X-ray scattering (WAXS) data from free-flying single nanoparticles. The analysis method is based on the concept of correlated X-ray scattering, in which correlations of scattered X-ray are used to recover detailed structural information. WAXS experiments of xenon nanoparticles, or clusters, were conducted at an XFEL facility in Japan by using the SPring-8 Ångstrom compact free-electron laser (SACLA). Bragg spots in the recorded single-shot X-ray diffraction patterns showed clear angular correlations, which offered significant structural information on the nanoparticles. The experimental angular correlations were reproduced by numerical simulation in which kinematical theory of diffraction was combined with geometric calculations. We also explain the diffuse scattering intensity as being due to the stacking faults in the xenon clusters., 01 Mar. 2020, 7, Pt 2, 276, 286, Scientific journal, True, 10.1107/S205225252000144X

Refereed, PHYSICAL REVIEW A, AMER PHYSICAL SOC, Real-time observation of disintegration processes within argon clusters ionized by a hard-x-ray pulse of moderate fluence, Yoshiaki Kumagai; Zoltan Jurek; Weiqing Xu; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Shin-ichi Wada; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Sang-Kil Son; Beata Ziaja; Robin Santra; Kiyoshi Ueda, We present a time-resolved study of disintegration within atomic clusters ionized by a hard-x-ray pulse of moderate fluence. It was performed with electron and ion spectroscopy, and complemented by theoretical simulations. The expanding clusters were probed with a near-infrared (NIR) laser pulse over a range of pump-probe delays from -4 to 10 ps. In addition to an increasing number of singly charged atomic ions, originating from the ionization of Rydberg atoms formed through electron-ion recombination, we observe a decrease of oligomer yields. The latter is due to the interaction of oligomers with the NIR probe pulse, leading to their dissociation. At time delays between -1 and 2 ps, efficient absorption of the NIR laser energy occurs, even though the NIR intensity is too low to trigger tuneling ionization of Ar atoms. Our observations are similar to earlier observations of the fragmentation behavior of clusters excited by soft-x-ray pulses. This indicates that the relaxation dynamics of x-ray-excited nano-objects are universal over a wide range of excitation photon energies., Feb. 2020, 101, 2, 023412, Scientific journal, 10.1103/PhysRevA.101.023412

Refereed, Applied Sciences, MDPI AG, The Magnitude and Waveform of Shock Waves Induced by X-ray Lasers in Water, Claudiu Andrei Stan; Koji Motomura; Gabriel Blaj; Yoshiaki Kumagai; Yiwen Li; Daehyun You; Taishi Ono; Armin Kalita; Tadashi Togashi; Shigeki Owada; Kensuke Tono; Makina Yabashi; Tetsuo Katayama; Kiyoshi Ueda, The high energy densities deposited in materials by focused X-ray laser pulses generate shock waves which travel away from the irradiated region, and can generate complex wave patterns or induce phase changes. We determined the time-pressure histories of shocks induced by X-ray laser pulses in liquid water microdrops, by measuring the surface velocity of the microdrops from images recorded during the reflection of the shock at the surface. Measurements were made with ~30 µm diameter droplets using 10 keV X-rays, for X-ray pulse energies that deposited linear energy densities from 3.5 to 120 mJ/m; measurements were also made with ~60 µm diameter drops for a narrower energy range. At a distance of 15 µm from the X-ray beam, the peak shock pressures ranged from 44 to 472 MPa, and the corresponding time-pressure histories of the shocks had a fast quasi-exponential decay with positive pressure durations estimated to range from 2 to 5 ns. Knowledge of the amplitude and waveform of the shock waves enables accurate modeling of shock propagation and experiment designs that either maximize or minimize the effect of shocks., Feb. 2020, 10, 4, 1497, 1497, Scientific journal, 10.3390/app10041497

Refereed, Science, Observation of the fastest chemical processes in the radiolysis of water, Loh, Z.-H.; Doumy, G.; Arnold, C.; Kjellsson, L.; Southworth, S.H.; Al Haddad, A.; Kumagai, Y.; Tu, M.-F.; Ho, P.J.; March, A.M.; Schaller, R.D.; Bin Mohd Yusof, M.S.; Debnath, T.; Simon, M.; Welsch, R.; Inhester, L.; Khalili, K.; N; a, K.; Krylov, A.I.; Moeller, S.; Coslovich, G.; Koralek, J.; Minitti, M.P.; Schlotter, W.F.; Rubensson, J.-E.; Santra, R.; Young, L., Elementary processes associated with ionization of liquid water provide a framework for understanding radiation-matter interactions in chemistry and biology. Although numerous studies have been conducted on the dynamics of the hydrated electron, its partner arising from ionization of liquid water, H2O+, remains elusive. We used tunable femtosecond soft x-ray pulses from an x-ray free electron laser to reveal the dynamics of the valence hole created by strong-field ionization and to track the primary proton transfer reaction giving rise to the formation of OH. The isolated resonance associated with the valence hole (H2O+/OH) enabled straightforward detection. Molecular dynamics simulations revealed that the x-ray spectra are sensitive to structural dynamics at the ionization site. We found signatures of hydrated-electron dynamics in the x-ray spectrum., 01 Jan. 2020, 367, 6474, 179, 182, Scientific journal, 10.1126/science.aaz4740

Refereed, Journal of Synchrotron Radiation, Micro-focused MHz pink beam for time-resolved X-ray emission spectroscopy, Tu, M.-F.; Doumy, G.; Al Haddad, A.; March, A.M.; Southworth, S.H.; Assoufid, L.; Kumagai, Y.; Walko, D.A.; Di Chiara, A.D.; Liu, Z.; Shi, B.; Young, L.; Bostedt, C., The full radiation from the first harmonic of a synchrotron undulator (between 5 and 12 keV) at the Advanced Photon Source is microfocused using a stack of beryllium compound refractive lenses onto a fast-moving liquid jet and overlapped with a high-repetition-rate optical laser. This micro-focused geometry is used to perform efficient nonresonant X-ray emission spectroscopy on transient species using a dispersive spectrometer geometry. The overall usable flux achieved on target is above 1015 photons s−1 at 8 keV, enabling photoexcited systems in the liquid phase to be tracked with time resolutions from tens of picoseconds to microseconds, and using the full emission spectrum, including the weak valence-to-core signal that is sensitive to chemically relevant electronic properties., 01 Nov. 2019, 26, Scientific journal, 10.1107/S1600577519012268

Refereed, Journal of Chemical Physics, {AIP} Publishing, Elucidation of the photoaquation reaction mechanism in ferrous hexacyanide using synchrotron x-rays with sub-pulse-duration sensitivity, March, A.M.; Doumy, G.; Andersen, A.; Al Haddad, A.; Kumagai, Y.; Tu, M.-F.; Bang, J.; Bostedt, C.; Uhlig, J.; Nascimento, D.R.; Assefa, T.A.; N{\'e}meth, Z.; Vank{\'o}, G.; Gawelda, W.; Govind, N.; Young, L., 14 Oct. 2019, 151, 14, 144306, 144306, Scientific journal, 10.1063/1.5117318

Refereed, Physical review letters, Ultrafast Structural Dynamics of Nanoparticles in Intense Laser Fields., Toshiyuki Nishiyama; Yoshiaki Kumagai; Akinobu Niozu; Hironobu Fukuzawa; Koji Motomura; Maximilian Bucher; Yuta Ito; Tsukasa Takanashi; Kazuki Asa; Yuhiro Sato; Daehyun You; Yiwen Li; Taishi Ono; Edwin Kukk; Catalin Miron; Liviu Neagu; Carlo Callegari; Michele Di Fraia; Giorgio Rossi; Davide E Galli; Tommaso Pincelli; Alessandro Colombo; Takashi Kameshima; Yasumasa Joti; Takaki Hatsui; Shigeki Owada; Tetsuo Katayama; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Kazuhiro Matsuda; Christoph Bostedt; Kiyonobu Nagaya; Kiyoshi Ueda, Femtosecond laser pulses have opened new frontiers for the study of ultrafast phase transitions and nonequilibrium states of matter. In this Letter, we report on structural dynamics in atomic clusters pumped with intense near-infrared (NIR) pulses into a nanoplasma state. Employing wide-angle scattering with intense femtosecond x-ray pulses from a free-electron laser source, we find that highly excited xenon nanoparticles retain their crystalline bulk structure and density in the inner core long after the driving NIR pulse. The observed emergence of structural disorder in the nanoplasma is consistent with a propagation from the surface to the inner core of the clusters., 20 Sep. 2019, 123, 12, 123201, 123201, Scientific journal, True, 10.1103/PhysRevLett.123.123201

Refereed, Nature communications, Real-time observation of X-ray-induced intramolecular and interatomic electronic decay in CH2I2., Hironobu Fukuzawa; Tsukasa Takanashi; Edwin Kukk; Koji Motomura; Shin-Ichi Wada; Kiyonobu Nagaya; Yuta Ito; Toshiyuki Nishiyama; Christophe Nicolas; Yoshiaki Kumagai; Denys Iablonskyi; Subhendu Mondal; Tetsuya Tachibana; Daehyun You; Syuhei Yamada; Yuta Sakakibara; Kazuki Asa; Yuhiro Sato; Tsukasa Sakai; Kenji Matsunami; Takayuki Umemoto; Kango Kariyazono; Shinji Kajimoto; Hikaru Sotome; Per Johnsson; Markus S Schöffler; Gregor Kastirke; Kuno Kooser; Xiao-Jing Liu; Theodor Asavei; Liviu Neagu; Serguei Molodtsov; Kohei Ochiai; Manabu Kanno; Kaoru Yamazaki; Shigeki Owada; Kanade Ogawa; Tetsuo Katayama; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Aryya Ghosh; Kirill Gokhberg; Lorenz S Cederbaum; Alexander I Kuleff; Hiroshi Fukumura; Naoki Kishimoto; Artem Rudenko; Catalin Miron; Hirohiko Kono; Kiyoshi Ueda, The increasing availability of X-ray free-electron lasers (XFELs) has catalyzed the development of single-object structural determination and of structural dynamics tracking in real-time. Disentangling the molecular-level reactions triggered by the interaction with an XFEL pulse is a fundamental step towards developing such applications. Here we report real-time observations of XFEL-induced electronic decay via short-lived transient electronic states in the diiodomethane molecule, using a femtosecond near-infrared probe laser. We determine the lifetimes of the transient states populated during the XFEL-induced Auger cascades and find that multiply charged iodine ions are issued from short-lived (∼20 fs) transient states, whereas the singly charged ones originate from significantly longer-lived states (∼100 fs). We identify the mechanisms behind these different time scales: contrary to the short-lived transient states which relax by molecular Auger decay, the long-lived ones decay by an interatomic Coulombic decay between two iodine atoms, during the molecular fragmentation., 16 May 2019, 10, 1, 2186, 2186, Scientific journal, True, 10.1038/s41467-019-10060-z

Refereed, Journal of Chemical Physics, Formation of hot hydrogen atoms from superexcited states of acetylene, Kumagai, Y.; Odagiri, T.; Nakano, M.; Suzuki, I.H.; Hosaka, K.; Kitajima, M.; Kouchi, N., 28 Dec. 2018, 149, 24, 244302, Scientific journal, 10.1063/1.5058101

Refereed, Physical Review X, Following the Birth of a Nanoplasma Produced by an Ultrashort Hard-X-Ray Laser in Xenon Clusters, Kumagai, Y.; Fukuzawa, H.; Motomura, K.; Iablonskyi, D.; Nagaya, K.; Wada, S.-I.; Ito, Y.; Takanashi, T.; Sakakibara, Y.; You, D.; Nishiyama, T.; Asa, K.; Sato, Y.; Umemoto, T.; Kariyazono, K.; Kukk, E.; Kooser, K.; Nicolas, C.; Miron, C.; Asavei, T.; Neagu, L.; Sch{\"o}ffler, M.S.; Kastirke, G.; Liu, X.-J.; Owada, S.; Katayama, T.; Togashi, T.; Tono, K.; Yabashi, M.; Golubev, N.V.; Gokhberg, K.; Cederbaum, L.S.; Kuleff, A.I.; Ueda, K., 02 Aug. 2018, 8, 3, 031034, Scientific journal, 10.1103/PhysRevX.8.031034

Refereed, Physical Review Letters, American Physical Society, Radiation-Induced Chemical Dynamics in Ar Clusters Exposed to Strong X-Ray Pulses, Yoshiaki Kumagai; Zoltan Jurek; Weiqing Xu; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Shin-Ichi Wada; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Sang-Kil Son; Beata Ziaja; Robin Santra; Kiyoshi Ueda, We show that electron and ion spectroscopy reveals the details of the oligomer formation in Ar clusters exposed to an x-ray free electron laser (XFEL) pulse, i.e., chemical dynamics triggered by x rays. With guidance from a dedicated molecular dynamics simulation tool, we find that van der Waals bonding, the oligomer formation mechanism, and charge transfer among the cluster constituents significantly affect ionization dynamics induced by an XFEL pulse of moderate fluence. Our results clearly demonstrate that XFEL pulses can be used not only to "damage and destroy" molecular assemblies but also to modify and transform their molecular structure. The accuracy of the predictions obtained makes it possible to apply the cluster spectroscopy, in connection with the respective simulations, for estimation of the XFEL pulse fluence in the fluence regime below single-atom multiple-photon absorption, which is hardly accessible with other diagnostic tools., 31 May 2018, 120, 22, 223201, Scientific journal, 10.1103/PhysRevLett.120.223201

Refereed, STRUCTURAL DYNAMICS, AMER INST PHYSICS, Time zero determination for FEL pump-probe studies based on ultrafast melting of bismuth, S. W. Epp; M. Hada; Y. Zhong; Y. Kumagai; K. Motomura; S. Mizote; T. Ono; S. Owada; D. Axford; S. Bakhtiarzadeh; H. Fukuzawa; Y. Hayashi; T. Katayama; A. Marx; H. M. Mueller-Werkmeister; R. L. Owen; D. A. Sherrell; K. Tono; K. Ueda; F. Westermeier; R. J. D. Miller, A common challenge for pump-probe studies of structural dynamics at X-ray free-electron lasers (XFELs) is the determination of time zero (T-0)-the time an optical pulse (e.g., an optical laser) arrives coincidently with the probe pulse (e.g., a XFEL pulse) at the sample position. In some cases, T-0 might be extracted from the structural dynamics of the sample's observed response itself, but generally, an independent robust method is required or would be superior to the inferred determination of T-0. In this paper, we present how the structural dynamics in ultrafast melting of bismuth can be exploited for a quickly performed, reliable and accurate determination of T-0 with a precision below 20 fs and an overall experimental accuracy of 50 fs to 150 fs (estimated). Our approach is potentially useful and applicable for fixed-target XFEL experiments, such as serial femtosecond crystallography, utilizing an optical pump pulse in the ultraviolet to near infrared spectral range and a pixelated 2D photon detector for recording crystallographic diffraction patterns in transmission geometry. In comparison to many other suitable approaches, our method is fairly independent of the pumping wavelength (UV-IR) as well as of the X-ray energy and offers a favorable signal contrast. The technique is exploitable not only for the determination of temporal characteristics of the experiment at the interaction point but also for investigating important conditions affecting experimental control such as spatial overlap and beam spot sizes. (C) 2017 Author(s)., Sep. 2017, 4, 5, 054308, Scientific journal, 10.1063/1.4999701

Refereed, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, ROYAL SOC CHEMISTRY, Ultrafast Coulomb explosion of a diiodomethane molecule induced by an X-ray free-electron laser pulse, Tsukasa Takanashi; Kosuke Nakamura; Edwin Kukk; Koji Motomura; Hironobu Fukuzawa; Kiyonobu Nagaya; Shin-ichi Wada; Yoshiaki Kumagai; Denys Iablonskyi; Yuta Ito; Yuta Sakakibara; Daehyun You; Toshiyuki Nishiyama; Kazuki Asa; Yuhiro Sato; Takayuki Umemoto; Kango Kariyazono; Kohei Ochiai; Manabu Kanno; Kaoru Yamazaki; Kuno Kooser; Christophe Nicolas; Catalin Miron; Theodor Asavei; Liviu Neagu; Markus Schoeffler; Gregor Kastirke; Xiao-Jing Liu; Artem Rudenko; Shigeki Owada; Tetsuo Katayama; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Hirohiko Kono; Kiyoshi Ueda, Coulomb explosion of diiodomethane CH2I2 molecules irradiated by ultrashort and intense X-ray pulses from SACLA, the Japanese X-ray free electron laser facility, was investigated by multi-ion coincidence measurements and self-consistent charge density-functional-based tight-binding (SCC-DFTB) simulations. The diiodomethane molecule, containing two heavy-atom X-ray absorbing sites, exhibits a rather different charge generation and nuclear motion dynamics compared to iodomethane CH3I with only a single heavy atom, as studied earlier. We focus on charge creation and distribution in CH2I2 in comparison to CH3I. The release of kinetic energy into atomic ion fragments is also studied by comparing SCC-DFTB simulations with the experiment. Compared to earlier simulations, several key enhancements are made, such as the introduction of a bond axis recoil model, where vibrational energy generated during charge creation processes induces only bond stretching or shrinking. We also propose an analytical Coulomb energy partition model to extract the essential mechanism of Coulomb explosion of molecules from the computed and the experimentally measured kinetic energies of fragment atomic ions by partitioning each pair Coulomb interaction energy into two ions of the pair under the constraint of momentum conservation. Effective internuclear distances assigned to individual fragment ions at the critical moment of the Coulomb explosion are then estimated from the average kinetic energies of the ions. We demonstrate, with good agreement between the experiment and the SCC-DFTB simulation, how the more heavily charged iodine fragments and their interplay define the characteristic features of the Coulomb explosion of CH2I2. The present study also confirms earlier findings concerning the magnitude of bond elongation in the ultrashort X-ray pulse duration, showing that structural damage to all but C-H bonds does not develop to a noticeable degree in the pulse length of similar to 10 fs., Aug. 2017, 19, 30, 19707, 19721, Scientific journal, 10.1039/c7cp01669g

Refereed, APPLIED SCIENCES-BASEL, MDPI AG, Application of Matched-Filter Concepts to Unbiased Selection of Data in Pump-Probe Experiments with Free Electron Lasers, Carlo Callegari; Tsukasa Takanashi; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Yoshiaki Kumagai; Subhendu Mondal; Tetsuya Tachibana; Kiyonobu Nagaya; Toshiyuki Nishiyama; Kenji Matsunami; Per Johnsson; Paolo Piseri; Giuseppe Sansone; Antoine Dubrouil; Maurizio Reduzzi; Paolo Carpeggiani; Caterina Vozzi; Michele Devetta; Davide Facciala; Francesca Calegari; Mattea Carmen Castrovilli; Marcello Coreno; Michele Alagia; Bernd Schuette; Nora Berrah; Oksana Plekan; Paola Finetti; Eugenio Ferrari; Kevin Charles Prince; Kiyoshi Ueda, Pump-probe experiments are commonly used at Free Electron Lasers (FEL) to elucidate the femtosecond dynamics of atoms, molecules, clusters, liquids and solids. Maximizing the signal-to-noise ratio of the measurements is often a primary need of the experiment, and the aggregation of repeated, rapid, scans of the pump-probe delay is preferable to a single long-lasting scan. The limited availability of beamtime makes it impractical to repeat measurements indiscriminately, and the large, rapid flow of single-shot data that need to be processed and aggregated into a dataset, makes it difficult to assess the quality of a measurement in real time. In post-analysis it is then necessary to devise unbiased criteria to select or reject datasets, and to assign the weight with which they enter the analysis. One such case was the measurement of the lifetime of Intermolecular Coulombic Decay in the weakly-bound neon dimer. We report on the method we used to accomplish this goal for the pump-probe delay scans that constitute the core of the measurement; namely we report on the use of simple auto- and cross-correlation techniques based on the general concept of matched filter. We are able to unambiguously assess the signal-to-noise ratio (SNR) of each scan, which then becomes the weight with which a scan enters the average of multiple scans. We also observe a clear gap in the values of SNR, and we discard all the scans below a SNR of 0.45. We are able to generate an average delay scan profile, suitable for further analysis: in our previous work we used it for comparison with theory. Here we argue that the method is sufficiently simple and devoid of human action to be applicable not only in post-analysis, but also for the real-time assessment of the quality of a dataset., Jun. 2017, 7, 6, 621, Scientific journal, 10.3390/app7060621

Refereed, PHYSICAL REVIEW LETTERS, AMER PHYSICAL SOC, Time-Resolved Measurement of Interatomic Coulombic Decay Induced by Two-Photon Double Excitation of Ne-2, T. Takanashi; N. V. Golubev; C. Callegari; H. Fukuzawa; K. Motomura; D. Iablonskyi; Y. Kumagai; S. Mondal; T. Tachibana; K. Nagaya; T. Nishiyama; K. Matsunami; P. Johnsson; P. Piseri; G. Sansone; A. Dubrouil; M. Reduzzi; P. Carpeggiani; C. Vozzi; M. Devetta; M. Negro; D. Facciala; F. Calegari; A. Trabattoni; M. C. Castrovilli; Y. Ovcharenko; M. Mudrich; F. Stienkemeier; M. Coreno; M. Alagia; B. Schuette; N. Berrah; O. Plekan; P. Finetti; C. Spezzani; E. Ferrari; E. Allaria; G. Penco; C. Serpico; G. De Ninno; B. Diviacco; S. Di Mitri; L. Giannessi; G. Jabbari; K. C. Prince; L. S. Cederbaum; Ph. V. Demekhin; A. I. Kuleff; K. Ueda, The hitherto unexplored two-photon doubly excited states [Ne* (2p(-1)3s)](2) were experimentally identified using the seeded, fully coherent, intense extreme ultraviolet free-electron laser FERMI. These states undergo ultrafast interatomic Coulombic decay (ICD), which predominantly produces singly ionized dimers. In order to obtain the rate of ICD, the resulting yield of Ne-2(+) ions was recorded as a function of delay between the extreme ultraviolet pump and UV probe laser pulses. The extracted lifetimes of the long-lived doubly excited states, 390(-130/+450) fs, and of the short-lived ones, less than 150 fs, are in good agreement with ab initio quantum mechanical calculations., Jan. 2017, 118, 3, 033202, Scientific journal, 10.1103/PhysRevLett.118.033202

Refereed, PHYSICAL REVIEW LETTERS, AMER PHYSICAL SOC, Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters, D. Iablonskyi; K. Nagaya; H. Fukuzawa; K. Motomura; Y. Kumagai; S. Mondal; T. Tachibana; T. Takanashi; T. Nishiyama; K. Matsunami; P. Johnsson; P. Piseri; G. Sansone; A. Dubrouil; M. Reduzzi; P. Carpeggiani; C. Vozzi; M. Devetta; M. Negro; F. Calegari; A. Trabattoni; M. C. Castrovilli; D. Facciala; Y. Ovcharenko; T. Moeller; M. Mudrich; F. Stienkemeier; M. Coreno; M. Alagia; B. Schuette; N. Berrah; A. I. Kuleff; G. Jabbari; C. Callegari; O. Plekan; P. Finetti; C. Spezzani; E. Ferrari; E. Allaria; G. Penco; C. Serpico; G. De Ninno; I. Nikolov; B. Diviacco; S. Di Mitri; L. Giannessi; K. C. Prince; K. Ueda, Ne clusters (similar to 5000 atoms) were resonantly excited (2p -> 3s) by intense free electron laser (FEL) radiation at FERMI. Such multiply excited clusters can decay nonradiatively via energy exchange between at least two neighboring excited atoms. Benefiting from the precise tunability and narrow bandwidth of seeded FEL radiation, specific sites of the Ne clusters were probed. We found that the relaxation of cluster surface atoms proceeds via a sequence of interatomic or intermolecular Coulombic decay (ICD) processes while ICD of bulk atoms is additionally affected by the surrounding excited medium via inelastic electron scattering. For both cases, cluster excitations relax to atomic states prior to ICD, showing that this kind of ICD is rather slow (picosecond range). Controlling the average number of excitations per cluster via the FEL intensity allows a coarse tuning of the ICD rate., Dec. 2016, 117, 27, 276806, Scientific journal, 10.1103/PhysRevLett.117.276806

Refereed, Nature Photonics, Nature Publishing Group, Coherent control with a short-wavelength free-electron laser, K. C. Prince; E. Allaria; C. Callegari; R. Cucini; G. De Ninno; S. Di Mitri; B. Diviacco; E. Ferrari; P. Finetti; D. Gauthier; L. Giannessi; N. Mahne; G. Penco; O. Plekan; L. Raimondi; P. Rebernik; E. Roussel; C. Svetina; M. Trovò; M. Zangrando; M. Negro; P. Carpeggiani; M. Reduzzi; G. Sansone; A. N. Grum-Grzhimailo; E. V. Gryzlova; S. I. Strakhova; K. Bartschat; N. Douguet; J. Venzke; D. Iablonskyi; Y. Kumagai; T. Takanashi; K. Ueda; A. Fischer; M. Coreno; F. Stienkemeier; Y. Ovcharenko; T. Mazza; M. Meyer, Extreme ultraviolet and X-ray free-electron lasers (FELs) produce short-wavelength pulses with high intensity, ultrashort duration, well-defined polarization and transverse coherence, and have been utilized for many experiments previously possible only at long wavelengths: multiphoton ionization, pumping an atomic laser and four-wave mixing spectroscopy. However one important optical technique, coherent control, has not yet been demonstrated, because self-amplified spontaneous emission FELs have limited longitudinal coherence. Single-colour pulses from the FERMI seeded FEL are longitudinally coherent, and two-colour emission is predicted to be coherent. Here, we demonstrate the phase correlation of two colours, and manipulate it to control an experiment. Light of wavelengths 63.0 and 31.5nm ionized neon, and we controlled the asymmetry of the photoelectron angular distribution by adjusting the phase, with a temporal resolution of 3as. This opens the door to new short-wavelength coherent control experiments with ultrahigh time resolution and chemical sensitivity., 26 Feb. 2016, 10, 3, 176, 179, Scientific journal, 10.1038/nphoton.2016.13

Refereed, FARADAY DISCUSSIONS, ROYAL SOC CHEMISTRY, Towards characterization of photo-excited electron transfer and catalysis in natural and artificial systems using XFELs, R. Alonso-Mori; K. Asa; U. Bergmann; A. S. Brewster; R. Chatterjee; J. K. Cooper; H. M. Frei; F. D. Fuller; E. Goggins; S. Gul; H. Fukuzawa; D. Iablonskyi; M. Ibrahim; T. Katayama; T. Kroll; Y. Kumagai; B. A. McClure; J. Messinger; K. Motomura; K. Nagaya; T. Nishiyama; C. Saracini; Y. Sato; N. K. Sauter; D. Sokaras; T. Takanashi; T. Togashi; K. Ueda; W. W. Weare; T-C Weng; M. Yabashi; V. K. Yachandra; I. D. Young; A. Zouni; J. F. Kern; J. Yano, The ultra-bright femtosecond X-ray pulses provided by X-ray Free Electron Lasers (XFELs) open capabilities for studying the structure and dynamics of a wide variety of biological and inorganic systems beyond what is possible at synchrotron sources. Although the structure and chemistry at the catalytic sites have been studied intensively in both biological and inorganic systems, a full understanding of the atomic-scale chemistry requires new approaches beyond the steady state X-ray crystallography and X-ray spectroscopy at cryogenic temperatures. Following the dynamic changes in the geometric and electronic structure at ambient conditions, while overcoming X-ray damage to the redox active catalytic center, is key for deriving reaction mechanisms. Such studies become possible by using the intense and ultra-short femtosecond X-ray pulses from an XFEL, where sample is probed before it is damaged. We have developed methodology for simultaneously collecting X-ray diffraction data and X-ray emission spectra, using an energy dispersive spectrometer, at ambient conditions, and used this approach to study the room temperature structure and intermediate states of the photosynthetic water oxidizing metallo-protein, photosystem II. Moreover, we have also used this setup to simultaneously collect the X-ray emission spectra from multiple metals to follow the ultrafast dynamics of light-induced charge transfer between multiple metal sites. A Mn-Ti containing system was studied at an XFEL to demonstrate the efficacy and potential of this method., 2016, 194, 621, 638, Scientific journal, 10.1039/c6fd00084c

Refereed, Science Advances, American Association for the Advancement of Science, Transient lattice contraction in the solid-to-plasma transition, Ken R. Ferguson; Maximilian Bucher; Tais Gorkhover; Sébastien Boutet; Hironobu Fukuzawa; Jason E. Koglin; Yoshiaki Kumagai; Alberto Lutman; Agostino Marinelli; Marc Messerschmidt; Kiyonobu Nagaya; Jim Turner; Kiyoshi Ueda; Garth J. Williams; Philip H. Bucksbaum; Christoph Bostedt, In condensed matter systems, strong optical excitations can induce phonon-driven processes that alter their mechanical properties. We report on a new phenomenon where a massive electronic excitation induces a collective change in the bond character that leads to transient lattice contraction. Single large van der Waals clusters were isochorically heated to a nanoplasma state with an intense 10-fs x-ray (pump) pulse. The structural evolution of the nanoplasma was probed with a second intense x-ray (probe) pulse, showing systematic contraction stemming from electron delocalization during the solid-to-plasma transition. These findings are relevant for any material in extreme conditions ranging from the time evolution of warm or hot dense matter to ultrafast imaging with intense x-ray pulses or, more generally, any situation that involves a condensed matter-to-plasma transition., 01 Jan. 2016, 2, 1, e1500837, Scientific journal, 10.1126/sciadv.1500837

Refereed, Physical Review A - Atomic, Molecular, and Optical Physics, American Physical Society, Angular correlation of a pair of Lyman-α photons produced in the photodissociation of H2, Nakanishi, Y.; Hosaka, K.; Kougo, R.; Odagiri, T.; Nakano, M.; Kumagai, Y.; Shiino, K.; Kitajima, M.; Kouchi, N., The angular correlation functions (ACFs) of a pair of Lyman-α photons emitted from H fragments in the photodissociation of a hydrogen molecule are measured at a 33.66-eV incident photon energy and at hydrogen gas pressures of approximately 0.1 and 1 Pa. The experimental ACFs are compared with (i) the theoretical ACF for entangled pairs of H(2p) atoms, where the magnetic quantum number of each hydrogen atom is indefinite, and (ii) the theoretical ACF for H(2p) pairs with definite magnetic quantum number of each hydrogen atom relative to the internuclear axis [the former entangled state of H(2p) pairs is a sum of the latter pair states with definite magnetic quantum number]. We conclude that the pair of H(2p) atoms in the photodissociation of H<SUB>2</SUB> is unlikely to be in the definite states of magnetic quantum number of each hydrogen atom relative to the internuclear axis, i.e., unlikely to be in the components of the entangled state of H(2p) pairs., 08 Oct. 2014, 90, 4, 043405, 043405-9, Scientific journal, 10.1103/PhysRevA.90.043405

Refereed, Physical Review A, Angular correlation of a pair of Lyman-alpha photons produced in the photodissociation of H-2, Nakanishi Yuko; Hosaka Kouichi; Kougo Ryoko; Odagiri Takeshi; Nakano Motoyoshi; Kumagai Yoshiaki; Shiino Kennichi; Kitajima Masashi; Kouchi Noriyuki, Oct. 2014, 90, 4, 043045, 10.1103/PhysRevA.90.043405

Refereed, JOURNAL OF CHEMICAL PHYSICS, AMER INST PHYSICS, Cross sections for the formation of H(n=2) atom via superexcited states in photoexcitation of methane and ammonia, Yoshiaki Kumagai; Takeshi Odagiri; Motoyoshi Nakano; Takehiko Tanabe; Isao H. Suzuki; Kouichi Hosaka; Masashi Kitajima; Noriyuki Kouchi, The absolute cross sections for the formation of the H(2s) and H(2p) atoms, sigma(2s) and sigma(2p), respectively, in photoexcitation of CH4 and NH3 were measured in the range of the incident photon energy 15-48 eV for studying superexcited states of the molecules. The same superexcited states were found to contribute to the sigma(2s) and sigma(2p) cross sections. It was concluded that the non-adiabatic transitions play a significant role during the dissociation of the superexcited states and ionic states. (C) 2013 AIP Publishing LLC., Oct. 2013, 139, 16, 164307, Scientific journal, 10.1063/1.4826460

Refereed, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, IOP PUBLISHING LTD, Three-body neutral dissociations of a multiply excited water molecule around the double ionization potential, Takeshi Odagiri; Motoyoshi Nakano; Takehiko Tanabe; Yoshiaki Kumagai; Isao H. Suzuki; Masashi Kitajima; Noriyuki Kouchi, The cross sections for emission of two fluorescence photons from a pair of excited fragments in photoexcitation of H2O have been measured as a function of the incident photon energy using the photon-photon coincidence technique. The cross section increased in the range 30-45 eV, i.e. in the vicinity of the double ionization potential of H2O. The increase of the cross section was attributed to three-body neutral dissociations of a water molecule via multiply excited states: H2O** -> H(2p) + OH** -> H(2p) + H(2p) + O(P-3). Some multiply excited states of H2O were also found in the cross section curve around 65 eV., Nov. 2012, 45, 21, 215204, Scientific journal, 10.1088/0953-4075/45/21/215204

Refereed, Physical Review A - Atomic, Molecular, and Optical Physics, American Institute of Physics, Formation of metastable atomic hydrogen in the 2s state from symmetry-resolved doubly excited states of molecular hydrogen, Takeshi Odagiri; Yoshiaki Kumagai; Motoyoshi Nakano; Takehiko Tanabe; Isao H. Suzuki; Masashi Kitajima; Noriyuki Kouchi, The cross sections for the formation of the metastable atomic hydrogen in the 2s state in photoexcitation of H2 and D2 were measured as a function of the incident photon energy in the range of the doubly excited states with their symmetries of the electronic states, 1Σu+ or 1Πu, being resolved. It has turned out from the comparison with the cross-section curves for other dissociation processes and the theoretical calculation that the Q21Πu(1) doubly excited state of H2 dissociates into both H(2s) + H(2p) and H(2p) + H(2p). The dissociation dynamics of this state has been discussed in terms of the nonadiabatic transition during neutral dissociations. © 2011 American Physical Society., 02 Nov. 2011, 84, 5, 053401 (8pp), Scientific journal, 10.1103/PhysRevA.84.053401

Refereed, Physical Review A, American Physical Society ({APS}), Reply to “Comment on ‘Effect of entanglement on the decay dynamics of a pair of H(2p) atoms due to spontaneous emission’ ”, Takehiko Tanabe; Takeshi Odagiri; Motoyoshi Nakano; Yoshiaki Kumagai; Isao H. Suzuki; Masashi Kitajima; Noriyuki Kouchi, In this Reply to the preceding Comment by Sancho and Plaja, we point out the difference between the

coincidence time spectrum of two Lyman-α photons measured by us and their theoretical one., 13 Jun. 2011, 83, 6, 066102, Scientific journal, 10.1103/physreva.83.066102

Physical Review A - Atomic, Molecular, and Optical Physics, Erratum: Effect of entanglement on the decay dynamics of a pair of H(2p) atoms due to spontaneous emission (Physical Review A - Atomic, Molecular, and Optical Physics (2011) 83:6 (066102), Tanabe, T.; Odagiri, T.; Nakano, M.; Kumagai, Y.; Suzuki, I.H.; Kitajima, M.; Kouchi, N., 2011, 83, 6, Scientific journal, 10.1103/PhysRevA.83.066102

Refereed, Physical Review A - Atomic, Molecular, and Optical Physics, Effect of entanglement on the decay dynamics of a pair of H(2p) atoms due to spontaneous emission, Tanabe, T.; Odagiri, T.; Nakano, M.; Kumagai, Y.; Suzuki, I.H.; Kitajima, M.; Kouchi, N., 20 Oct. 2010, 82, 4, 040101, Scientific journal, 10.1103/PhysRevA.82.040101

Refereed, REVIEW OF SCIENTIFIC INSTRUMENTS, AMER INST PHYSICS, A new spectroscopic method for resolving the electronic symmetry properties of the highly excited molecules produced in photoexcitation, Takeshi Odagiri; Yoshiaki Kumagai; Takehiko Tanabe; Motoyoshi Nakano; Isao H. Suzuki; Masashi Kitajima; Noriyuki Kouchi, A novel method of spectroscopy for highly excited states of molecules in the valence excitation range has been established through the detection of metastable hydrogen atoms in the 2s state formed by photoexcitation. The detector for the metastable hydrogen atom is composed of a stack of parallel plate electrodes that creates a localized electric field and triggers the emission of the Lyman-alpha photon from the atom and a chevron pair of microchannel plates that detects the photon. For linear molecules, the angle-resolved detection of the metastable hydrogen atom enables us to measure cross sections in which electronic symmetries of highly excited molecular states are resolved. Such symmetry-resolved cross section measurements were carried out for doubly excited states of H(2). (C) 2010 American Institute of Physics. [doi:10.1063/1.3436653], Jun. 2010, 81, 6, 063108, Scientific journal, 10.1063/1.3436653

Refereed, The International Conference on Ultrafast Phenomena (UP) 2022, Optica Publishing Group, Time-resolved Imaging of Transient Charge Transfer Dynamics, Felix Allum; Yoshiaki Kumagai; Kiyonobu Nagaya; James Harries; Hiroshi Iwayama; Akinobu Niozu; Mike Ashfold; Mathew Britton; Philip Bucksbaum; Mark Brouard; Michael Burt; David Heathcote; Paul Hockett; Andrew Howard; Edwin Kukk; Jason Lee; Yusong Liu; Joseph McManus; Dennis Milesevic; Russell Minns; Johannes Niskannen; Andrew Orr-Ewing; Daniel Rolles; Artem Rudenko; Kiyoshi Ueda; James Unwin; Claire Vallance; Tiffanny Walmsley; Ruaridh Forbes, We study ultrafast charge transfer processes as a function of interfragment separation in dissociating iodopropane molecules using time-resolved site-selective ionization with intense extreme-ultraviolet (XUV) light., Jul. 2022, Th4A.3e, Introduction international proceedings, 10.1364/up.2022.th4a.3

Study of Dynamics by Light-Matter Interaction: From Atoms to Complex Systems, Smithfield, RI (United States), 11-12 Jun 2022, US DOE, Ultrafast probing of charge transfer dynamics with an XUV free-electron laser, Felix Allum; Yoshiaki Kumagai; Kiyonobu Nagaya; James Harries; Hiroshi Iwayama; Akinobu Niozu; Mike Ashfold; Matthew Britton; Phillip Bucksbaum; Mark Brouard; Michael Burt; David Heathcote; Paul Hockett; Yusong Liu; Edwin Kukk; Jason Lee; Yusong Liu; Joseph McManus; Dennis Milesevic; Russell Minns; Johannes Niskannen; Andrew Orr-Ewing; Daniel Rolles; Artem Rudenko; Kiyoshi Ueda; James Unwin; Claire Vallance; Tiffany Walmsley; Ruaridh Forbes, 11 Jun. 2022, 10.2172/1871650

2022, 35th

日本物理学会講演概要集(CD-ROM), Ion mass spectrometry for studying the radiation effect of aqueous molecules, 熊谷嘉晃; 土屋貴寛; 宮後海帆; 寺尾優作; 鈴木一世; 金井唯; 黒瀬研二; 鵜飼正敏; 横谷明徳; 藤井健太郎; 福田義博; 斎藤祐児, 2022, 77, 1

SPring-8/SACLA Research Frontiers 2020, Ultrafast structural dynamics of highly excited nanoparticles in intense laser fields, Toshiyuki Nishiyama Hiraki; Yoshiaki Kumagai; Kiyonobu Nagaya; Kiyoshi Ueda, Aug. 2021, 68, 69, Introduction research institution

日本物理学会講演概要集(CD-ROM), Study on radiation damaging intermediates of DNA by measuring x-ray induced luminescence, 寺尾優作; 熊谷嘉晃; 鈴木一世; 土屋貴寛; 鵜飼正敏; 横谷明徳; 藤井健太郎; 福田義博; 斎藤祐児, 2021, 76, 2

2021, 46th (Web)

2021, 46th (Web)

放射線化学討論会講演要旨集, X-ray induced luminescence of hydrated nucleotide molecules, 寺尾優作; 熊谷嘉晃; 鈴木一世; 土屋貴寛; 鵜飼正敏; 横谷明徳; 藤井健太郎; 福田義博; 斎藤祐児, 2021, 64th (CD-ROM)

Not Refereed, The birth of a nanoplasma produced by an ultrashort hardxray laser in xenon clusters, Kumagai Yoshiaki; Hironobu Fukuzawa; Kiyonobu Nagaya; Shin-ichi Wada; Kiyoshi Ueda, Jan. 2020, 33, 1, 10, 18, Introduction scientific journal

Not Refereed, 日本物理学会講演概要集(CD-ROM), XFELによる単一Xeナノ粒子内部の積層欠陥の評価, 仁王頭明伸; 仁王頭明伸; 熊谷嘉晃; 西山俊幸; 西山俊幸; 福澤宏宣; 福澤宏宣; 本村幸治; BUCHER Max; 伊藤雄太; 高梨司; 浅和貴; 浅和貴; 佐藤由比呂; 佐藤由比呂; YOU Daehyun; 小野太詩; LI Yiwen; KUKK Edwin; MIRON Catalin; MIRON Catalin; NEAGU Liviu; CALLEGARI Carlo; FRAIA Michele; ROSSI Giorgio; GALLI Davide; PINCELLI Tomasso; COLOMBO Alessandro; 亀島敬; 城地保昌; 富樫格; 初井宇記; 大和田成起; 片山哲夫; 登野健介; 矢橋牧名; 松田和博; BOSTEDT Christoph; 永谷清信; 永谷清信; 上田潔; 上田潔, 22 Mar. 2019, 74, 1, ROMBUNNO.17aK201‐10

Not Refereed, ScienceAlert, Insanely Intense X-Ray Lasers Have Recorded Nanoplasma Generation For The First Time, Oct. 2018, Introduction commerce magazine

Not Refereed, Cosmos, Incredibly tiny explosion packs a big punch, Oct. 2018, Introduction commerce magazine

Not Refereed, Nature Research Highlights, Weird form of matter seen at the moment of creation, Oct. 2018, Report scientific journal

Not Refereed, Physics, Synopsis: Observing the Birth of a Nanoplasma, Oct. 2018, Introduction scientific journal

Refereed, Abstracts Of Papers Of The American Chemical Society, Revealing hole trapping in zinc oxide nanoparticles by time-resolved X-ray spectroscopy, Penfold Tom; Szlachetko Jakub; Gawelda Wojciech; Santomauro Fabio; Britz Alexander; van Driel Tim; Sala Leonardo; Ebner Simon; Southworth Steve; Doumy Gilles; March Anne Marie; Lehmann Stefan; Katayama Tetsuo; Mucke Melanie; Iablonskyi Denya; Kumagai Yoshiaki; Knopp Gregor; Motomura Koji; Togashi Tadashi; Owada Shigeki; Yabashi Makina; Rittmann Jochen; Nielsen Martin; Pajek Marek; Ueda Kiyoshi; Chergui Majed; Abela Rafael; Milne Chris, Aug. 2018, 256

Not Refereed, Phys.org, Recording the birth of a nanoplasma, Aug. 2018, Introduction commerce magazine

Not Refereed, 日本物理学会講演概要集(CD-ROM), XFELによる単一Xeナノ粒子の結晶ドメイン構造の解明, 仁王頭明伸; 仁王頭明伸; 西山俊幸; 西山俊幸; 熊谷嘉晃; 福澤宏宣; 福澤宏宣; 本村幸治; BUCHER Max; 伊藤雄太; 高梨司; 浅和貴; 浅和貴; 佐藤由比呂; 佐藤由比呂; YOU Daehyun; 小野太詩; LI Yiwen; KUKK Edwin; MIRON Catalin; MIRON Catalin; LIVIU Neagu; CALLEGARI Carlo; FRAIA Michele; ROSSI Giorgio; GALLI Davide; PINCELLI Tomasso; COLOMBO Alessandro; 亀島敬; 城地保昌; 富樫格; 初井宇記; 大和田成起; 片山哲夫; 登野健介; 矢橋牧名; 松田和博; BOSTEDT Christoph; 永谷清信; 永谷清信; 上田潔, 23 Mar. 2018, 73, 1, ROMBUNNO.23aK204‐1

Refereed, Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, Revealing crystalline domains in Xe nanoparticles using XFEL, Niozu Akinobu; Sato Yuhiro; You Daehyun; Ono Taishi; Li Yiewn; Kukk Edwin; Miron Catalin; Neagu Liviu; Callegari Carlo; Fraia Michele; Rossi Giorgio; Kumagai Yoshiaki; Galli Davide; Pincelli Tomasso; Alessandro Colombo; Kameshima Takashi; Joti Yasumasa; Togashi Tadashi; Hatsui Takaki; Owada Shigeki; Katayama Tetsuo; Tono Kensuke; Nishiyama Toshiyuki; Yabashi Makina; Matsuda Kazuhiro; Bostedt Christoph; Nagaya Kiyonobu; Ueda Kiyoshi; Fukuzawa Hironobu; Motomura Koji; Max Bucher; Ito Yuta; Takanashi Tsukasa; Asa Kazuki, 2018, 73, 0, 665, 665, 10.11316/jpsgaiyo.73.1.0_665

Refereed, Journal of Physics Conference Series, Cross sections for the formation of H(2p) atom via doubly excited states in photoexcitation of rotationally cold H2, Y. Abe; T. Odagiri; S. Ohrui; T. Taniguchi; T. Shiratori; M. Kaida; K. Yachi; Y. Kumagai; K. Hosaka; M. Kitajima; N. Kouchi, Jul. 2017, 875, 4, 032037

Refereed, 2017 Conference on Lasers and Electro-Optics and European Quantum Electronics Conference (CLEO/EUROPE-EQEC), Ultrafast Imaging of Transient States and Non-Equilibrium Dynamics in Clusters with X-ray Laser Based Pump-Probe Techniques, Maximilian Bucher; Phay Ho; Ken R. Ferguson; Tais Gorkhover; Agostino Marinelli; Daniela Rupp; O. Gessner; A. Vilesov; D. Rolles; Artem Rudenko; Kionobu Nagaya; Yoshiaki Kumagai; Kiyoshi Ueda; Linda Young; Thomas Möller; Christoph Bostedt, Jun. 2017

Not Refereed, Optics InfoBase Conference Papers, OSA - The Optical Society, Femtosecond X-ray absorption and emission spectroscopy on zno nanoparticles in solution, Thomas J. Penfold; Jakub Szlachetko; Wojciech Gawelda; Fabio G. Santomauro; Alexander Britz; Tim B. van Drie; Leonardo Sala; Simon Ebner; Stephen H. Southworth; Gilles Doumy; Anne Marie March; Carl S. Lehmann; Tetsuo Katayama; Melanie Mucke; Denis Iablonskyi; Yoshiaki Kumagai; Gregor Knopp; Koji Motomura; Tadashi Togashi; Shigeki Owada; Makina Yabashi; Jochen Rittmann; Martin M. Nielsen; Marek Pajek; Kiyoshi Ueda; Majed Chergui; Rafael Abela; Christopher J. Milne, We have performed femtosecond X-ray spectroscopy measurements after UV photoexcitation of a colloidal solution of ZnO nanoparticles. The results indicate sub-ps hole trapping at oxygen vacancies with shallowly-trapped electrons in the conduction band., 18 Jul. 2016, 10.1364/UP.2016.UF1A.6

Refereed, Optics InfoBase Conference Papers, OSA - The Optical Society, Femtosecond time-resolved study on nanoplasma dynamics of xenon clusters irradiated with high intensity hard X-rays at SACLA, Y. Kumagai; H. Fukuzawa; K. Motomura; D. Iablonskyi; K. Nagaya; S. Wada; Y. Ito; T. Takanashi; Y. Sakakibara; D. You; T. Nishiyama; K. Asa; Y. Sato; T. Umemoto; K. Kariyazono; E. Kukk; K. Kooser; C. Nicolas; C. Miron; T. Asavei; L. Neagu; M. Schöffler; G. Kastirke; X. J. Liu; S. Owada; T. Katayama; T. Togashi; K. Tono; M. Yabashi; M. Yao; K. Ueda, A time-resolved experiment on Xe clusters using XFEL pump-NIR probe technique was performed with femtosecond resolution at SACLA using a timing monitor for the measurement of the time jitter between the XFEL and NIR pulses., 18 Jul. 2016, 10.1364/UP.2016.UW4A.20

Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 22pAE-4 Time-resolved measurement for photo-induced reaction of diiodomethane using X-ray free-electron laser from SACLA, Takanashi T.; Fukuzawa H.; Motomura K.; Nagaya K.; Wada S.; Kumagai Y.; Iablonskyi Denys; Mondal Subhendu; Ito Y.; Tachibana R.; Yamada S.; Sakakibara Y.; You Daehyun; Nishiyama T.; Matsunami K.; Sakai T.; Asa K.; Sato Y.; Umemoto T.; Kariyazono K.; Kajimoto S.; Sotome H.; Kukk Edwin; Kooser Kuno; Nicolas Christophe; Miron Catalin; Schoeffler Markus; Kastirke Gregor; Johnsson Per; Asavei Theodor; Neagu Liviu; Liu Xiao-Jing; Molodtsov Serguei; Togashi T.; Ogawa K.; Owada S.; Katayama T.; Tono K.; Yabashi M.; Rudenko Artem; Fukumura H.; Yao M.; Ueda K., 2016, 71, 812, 812, 10.11316/jpsgaiyo.71.1.0_812

Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 22pAE-5 Real-time study on decay dynamics of nanoplasma formed by XFEL irradiation in rare gas clusters at SACLA, Kumagai Y.; Xu W. Q.; Jurek Z.; Fukuzawa H.; Motomura K.; Iablonski D.; Nagaya K.; Wada S.; Mondal S.; Tachibana T.; Ito Y; Takanashi T.; Yamda S.; Sakakibara Y.; Sakai T.; Matsunami K.; Nishiyama T.; Umemoto T.; Nicolas C.; Patanen M.; Bozek J.; Dancus I.; Cernaianu M.; Miron C.; Bauer T.; Mucke M.; Kukk E.; Togashi T.; Ogawa K.; Owada S.; Tono K.; Yabashi M.; Son S.-K.; Ziaja B.; Yao M.; Santra R.; Ueda K., 2016, 71, 813, 813, 10.11316/jpsgaiyo.71.1.0_813

Not Refereed, Journal of Physics: Conference Series, Interatomic Coulombic Decay Processes after Multiple Valence Excitations in Ne Clusters, D. Iablonskyi; K. Nagaya; H. Fukuzawa; K. Motomura; Y. Kumagai; S. Mondal; T. Tachibana; T. Takanashi; T. Nishiyama; K. Matsunami; P. Johnsson; P. Piseri; G. Sansone; A. Dubrouil; M. Reduzzi; P. Carpeggiani; C. Vozzi; M. Devetta; M. Negro; D. Faccialà; F. Calegari; A. Trabattoni; M. Castrovilli; Y. Ovcharenko; T. Möller; M. Mudrich; F. Stienkemeier; M. Coreno; M. Alagia; B. Schütte; N. Berrah; C. Callegari; O. Plekan; P. Finetti; C. Spezzani; E. Ferrari; E. Allaria; G. Penco; C. Serpico; G. De Ninno; B. Diviacco; S. Di Mitri; L. Giannessi; K. C. Prince; M. Yao; K. Ueda, © Published under licence by IOP Publishing Ltd. We present a comprehensive analysis of autoionization processes in Ne clusters (∼5000 atoms) after multiple valence excitations by free electron laser radiation. The evolution from 2-body interatomic Coulombic decay (ICD) to 3-body ICD is demonstrated when changing from surface to bulk Frenkel exciton excitation. Super Coster-Kronig type 2-body ICD is observed at Wannier exciton which quenches the main ICD channel., 07 Sep. 2015, 635, 10.1088/1742-6596/635/11/112067

Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 24pBG-1 Cross sections for the emission of the Lyman-α photon from the doubly excited states of para-hydrogen, Ohrui S.; Shiratori T.; Kaida M.; Odagiri T.; Yachi K.; Kumagai Y.; Hosaka K.; Kitajima M.; Kouchi N., 2015, 70, 787, 787, 10.11316/jpsgaiyo.70.1.0_787

Refereed, XXIX INTERNATIONAL CONFERENCE ON PHOTONIC, ELECTRONIC, AND ATOMIC COLLISIONS (ICPEAC2015), PTS 1-12, IOP PUBLISHING LTD, Angular correlation measurements of a pair of Lyman-alpha photons emitted in the photodissociation of H-2, K. Hosaka; Y. Nakanishi; R. Kogo; P. Schmidt; Y. Torizuka; K. Shigemura; T. Odagiri; A. Knie; K. Jankala; A. Ehresmann; M. Nakano; Y. Kumagai; K. Shiino; M. Kitajima; N. Kouchi, The angular correlation functions of a pair of Lyman-alpha photons in the photodissociation of H-2 are measured more precisely than in the early experiments [Nakanishi et. al., Phys. Rev. A. 90, 043405(2014)]. The linearly polarized light is used to excite the photodissociation via the doubly excited Q(2) (1)Pi(u)(1) state., 2015, 635, 11, 112016, 10.1088/1742-6596/635/11/112016

Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 9pAT-10 Time-Resolved Measurements of ICD Processes Induced by Two-photon Double Excitation in Ne_2, Takanashi T.; Fukuzawa H.; Motomura K.; Kumagai Y.; Subhendu Mondal; Tachibana T.; Nishiyama T.; Matsunami K.; Nagaya K.; Johnsson Per; Riseri Paolo; Sansone Giuseppe; Dubrouil Antoine; Reduzzi Maurizio; Carpeggiani Paolo; Vozzi Caterina; Devetta Miohele; Negro Matteo; Facciala Davide; Calegari Francesca; Trabattoni Andrea; Castrovilli Mattea; Ovcharenko Yevheniy; Marcel Mudrich; Frank Stienkemeier; Coreno Marcello; Alagia Michele; Schutte Bernd; Berrah Nora; Carlo CallegariCarlo; Plekan Oksana; Finetti Paola; Giannessi Luca; Prince Kevin; Yao M.; Ueda K., 22 Aug. 2014, 69, 2, 89, 89

Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 9pAT-11 Time-resolved measurements of XFEL-induced nanoplasma probed by NIR laser, Fukuzawa H.; Kumagai Y.; Xu Weiqing; Motomura K.; Nagaya K.; Wada S.; Mondal Subhendu; Tachibana T.; Ito Y.; Sakai T.; Matsunami K.; Nishiyama T.; Umemoto T.; Nicolas Christophe; Miron Catalin; Togashi T.; Ogawa K.; Owada S.; Tono K.; Yabashi M.; Jurek Zoltan; Son Sang-Kil; Ziaja Baeta; Yao M.; Santra Robin; Ueda K., 22 Aug. 2014, 69, 2, 89, 89

Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 29pCH-4 Photo dissociation dynamics of doubly excited states of para-hydrogen, Ohrui S.; Shiratori T.; Odagiri T.; Kumagai Y.; Hosaka K.; Kitajima M.; Kouchi N., 05 Mar. 2014, 69, 1, 209, 209

Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 28pED-11 Angular distribution of Lyman-α photons produced in photodissociation of H_2, Kougo R.; Hosaka K.; Nakanishi Y.; Nakano M.; Kumagai Y.; Suzuki I. H.; Odagiri T.; Kitajima M.; Kouchi N., 26 Mar. 2013, 68, 1, 231, 231

Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 27aAB-11 Decay dynamics of entangled pair of H(2p) atoms, Nakanishi Y.; Hosaka K.; Odagiri T.; Nakano M.; Kumagai Y.; Suzuki I.H.; Kitajima M.; Kouchi N., 05 Mar. 2012, 67, 1, 229, 229

31 Mar. 2011, 24, 2, 96, 98

Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 26aRH-4 Production of H(2s) fragment atoms from doubly excited states of methane and ammonia, Kumagai Y.; Odagiri T.; Tanabe T.; Nakano M.; Suzuki H.; Kouchi N., 18 Aug. 2010, 65, 2, 166, 166

Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 25pRF-14 Anomalous decay of an entangled pair of H(2p) atoms generated by the photodissociation of H_2, Tanabe T.; Odagiri T.; Hosaka K.; Nakano M.; Kumagai Y.; Suzuki H.; Kitajima M.; Kouchi N., 18 Aug. 2010, 65, 2, 157, 157

Refereed, Journal of Physics Conference Series, Symmetry-resolved spectroscopy by detection of a metastable hydrogen atom for investigating the doubly excited states of molecular hydrogen, Takeshi Odagiri; Yoshiaki Kumagai; Takehiko Tanabe; Motoyoshi Nakano; Isao H Suzuki; Noriyuki Kouchi, Nov. 2009, 194, 2, 022017

Refereed, Journal of Physics Conference Series, Generation of a pair of photons through the three-body dissociation of a multiply excited water molecule around the double ionization potential, Takeshi Odagiri; Motoyoshi Nakano; Takehiko Tanabe; Yoshiaki Kumagai; Isao H Suzuki; Noriyuki Kouchi, Nov. 2009, 194, 2, 022021

Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 25pZF-10 Generation and change of the entanglement in a pair of H(2p) atoms produced by photodissociation of H_2, Tanabe T.; Odagiri T.; Nakano M.; Kumagai Y.; Suzuki I. H.; Kouchi N., 18 Aug. 2009, 64, 2, 64, 64

Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 27aSL-2 Symmetry-resolved spectroscopy for doubly excited states of molecular hydrogen through detection of metastable hydrogen atom, Odagiri T.; Kumagai Y.; Tanabe T.; Nakano M.; Suzuki I. H.; Kouchi N., 03 Mar. 2009, 64, 1, 134, 134

18 Mar. 2025, 18 Mar. 2025 - 21 Mar. 2025

18 Mar. 2025, 18 Mar. 2025 - 21 Mar. 2025

18 Mar. 2025, 18 Mar. 2025 - 21 Mar. 2025

Hinako Imamura; Yoshiaki Kumagai; Kunikazu Ishi, 30th International Conference on Atomic Collisions in Solids & 12th International Symposium on Swift Heavy Ions in Matter, Development of an Experimental Method for Measuring Stopping Cross-Sections in Liquid Phase Using MeV-Projectile Ions, Poster presentation, 29 Nov. 2024, 24 Nov. 2024 - 29 Nov. 2024

A. Okano; S. Oishi; C. Liu; Y. Kumagai; T. H. Dinh; S. Kojima; H. Sakaki; K. Ishii, 30th International Conference on Atomic Collisions in Solids & 12th International Symposium on Swift Heavy Ions in Matter, Design for the clarification of X-ray emission phenomena from solids by spatio-temporally focused ion beams, Poster presentation, 26 Nov. 2024, 24 Nov. 2024 - 29 Nov. 2024

S. Oishi; S. Kojima; Dinh Thannhung; H. Matsumoto; M. Murakawa; A. Okano; K. Ishii; Y Kumagai; H. Sakaki, 30th International Conference on Atomic Collisions in Solids & 12th International Symposium on Swift Heavy Ions in Matter, Development of ultra-short-pulse beam injector with the laser-driven acceleration for interactions at surfaces, Poster presentation, 26 Nov. 2024, 24 Nov. 2024 - 29 Nov. 2024

Kunikazu Ishii; Nanami Watanabe; Yoshiaki Kumagai, 30th International Conference on Atomic Collisions in Solids & 12th International Symposium on Swift Heavy Ions in Matter, Classical Orbital Simulation of Rainbow Scattering Patterns Induced by Fast Ions Passing through Graphene, Poster presentation, 26 Nov. 2024, 24 Nov. 2024 - 29 Nov. 2024

Hinako Imamura; Yoshiaki Kumagai; Kunikazu Ishi, 30th International Conference on Atomic Collisions in Solids & 12th International Symposium on Swift Heavy Ions in Matter, Development of an Experimental Method for Measuring Stopping Cross-Sections in Liquid Phase Using MeV-Projectile Ions, Oral presentation, 26 Nov. 2024, 24 Nov. 2024 - 29 Nov. 2024

Yoshiaki Kumagai; Hinako Imamura; Kunikazu Ishii, 30th International Conference on Atomic Collisions in Solids & 12th International Symposium on Swift Heavy Ions in Matter, Simulating Energy-Loss Spectrum in Thin Water Sheets Using PHITS Code for Developing a Novel MeV-Ion Beam Experiment Setup, Poster presentation, 26 Nov. 2024, 24 Nov. 2024 - 29 Nov. 2024

Kanae Saito; Yoshiaki Kumagaii; Kunikzau Ishi, 30th International Conference on Atomic Collisions in Solids & 12th International Symposium on Swift Heavy Ions in Matter, Dissociation phenomena associated with the penetration of diatomic molecular ions through graphene, Poster presentation, 26 Nov. 2024, 24 Nov. 2024 - 29 Nov. 2024

Poster presentation, 20 Sep. 2024, 18 Sep. 2024 - 21 Sep. 2024

Oral presentation, 16 Sep. 2024, 18 Sep. 2024 - 19 Sep. 2024

Oral presentation, 18 Sep. 2024, 16 Sep. 2024 - 19 Sep. 2024

Oral presentation, 17 Sep. 2024, 16 Sep. 2024 - 19 Sep. 2024

Yoshiaki Kumagai, 15th Asian International Seminar on Atomic and Molecular Physics, Ion momentum imaging with extreme ultraviolet laser pulses, Invited oral presentation, 19 Aug. 2024, 19 Aug. 2024 - 23 Aug. 2024

Invited oral presentation, 08 Aug. 2024, 07 Aug. 2024 - 09 Aug. 2024

Poster presentation, 07 Aug. 2024, 07 Aug. 2024 - 09 Aug. 2024

Poster presentation, 07 Aug. 2024, 07 Aug. 2024 - 09 Aug. 2024

Poster presentation, 07 Aug. 2024, 07 Aug. 2024 - 09 Aug. 2024

Poster presentation, 07 Aug. 2024, 07 Aug. 2024 - 09 Aug. 2024

Poster presentation, 07 Aug. 2024, 07 Aug. 2024 - 09 Aug. 2024

Oral presentation, 01 Aug. 2024, 31 Jul. 2024 - 03 Aug. 2024

Poster presentation, 31 Jul. 2024, 31 Jul. 2024 - 03 Aug. 2024

Oral presentation, 28 Jun. 2024, 27 Jun. 2024 - 28 Jun. 2024

Invited oral presentation, 11 Jan. 2024, 10 Jan. 2024 - 12 Jan. 2024

Poster presentation, 25 Nov. 2023, 25 Nov. 2023 - 26 Nov. 2023

Poster presentation, 25 Nov. 2023, 25 Nov. 2023 - 26 Nov. 2023

Poster presentation, 25 Nov. 2023, 25 Nov. 2023 - 26 Nov. 2023

Poster presentation, 25 Nov. 2023, 25 Nov. 2023 - 26 Nov. 2023

Invited oral presentation, 20 Oct. 2023, 20 Oct. 2023 - 20 Oct. 2023

N. Watanabe; M. Otsuka; Y. Fukunaga; N. Kume; Z. Li; Y. Kumagai; K. Ishii, IBA&PIXE2023, Rainbow scattering of ion beam by graphene sheet, Poster presentation, 12 Oct. 2023, 07 Oct. 2023 - 13 Oct. 2023

Kyoka Imaeda; Kanae Saito; Yoshiaki Kumagai; Kunikazu Ishii, IBA&PIXE2023, Dissociation phenomena of LiH+ ion by carbon thin film penetration, Poster presentation, 12 Oct. 2023, 07 Oct. 2023 - 13 Oct. 2023

Oral presentation, 16 Sep. 2023, 16 Sep. 2023 - 19 Sep. 2023

Oral presentation, 16 Sep. 2023, 16 Sep. 2023 - 19 Sep. 2023

Oral presentation, 17 Sep. 2022, 16 Sep. 2023 - 19 Sep. 2023

Yusaku Terao; Yoshiaki Kumagai; Issei Suzuki; Takahiro Tsuchiya; Masatoshi Ukai; Akinari Yokoya; Kentaro Fujii; Yoshihiro Fukuda; Yuji Saitoh, DPG Spring Meeting of the Atomic, Molecular, Quantum Optics and Photonics Section, X-ray induced luminescence for DNA molecules in aqueous solution via nitrogen core ionization, Oral presentation, 10 Mar. 2023, 05 Mar. 2023 - 10 Mar. 2023

Yoshiaki Kumagai; Yusaku Terao; Issei Suzuki; Takahiro Tsuchiya; Masatoshi Ukai; Akinari Yokoya; Kentaro Fujii; Yoshihiro Fukuda; Yuji Saitoh, International Workshop on Photoionization Resonant Inelastic X-ray Scattering 2022, X-ray induced luminescent intermediates of DNA damage using synchrotron radiation, 16 Nov. 2022, 15 Nov. 2022 - 19 Nov. 2022

11 Sep. 2022, 10 Sep. 2022 - 12 Sep. 2022

08 Sep. 2022, 08 Sep. 2022 - 09 Sep. 2022

Yoshiaki Kumagai, Molecular and Ionic Clusters Gordon Research Conference, Ultrafast Electronic and Nuclear Dynamics in the Rare-Gas Cluster Induced by the Hard-X-Ray Laser, 09 Aug. 2022, 07 Aug. 2022 - 12 Aug. 2022

Yoshiaki Kumagai, International workshop on theory for attosecond quantum dynamics (IWTAQD) 25, Ultrafast electronic and nuclear dynamics in atomic clusters induced by hard-x-ray lasers, 04 Aug. 2022, 04 Aug. 2022 - 04 Aug. 2022

Felix Allum; Yoshiaki Kumagai; Kiyonobu Nagaya; James Harries; Hiroshi Iwayama; Akinobu Niozu; Mike Ashfold; Mathew Britton; Philip Bucksbaum; Mark Brouard; Michael Bur; David Heathcote; Paul Hocke; Andrew Howard; Edwin Kukk; Jason Lee; Yusong Liu; Joseph McManus; Dennis Milesevic; Russell Minns; Johannes Niskannen; Andrew Orr-Ewing; Daniel Rolles; Artem Rudenko; Kiyoshi Ueda; James Unwin; Claire Vallance; Tiffanny Walmsley; Ruaridh Forbes, International Conference on Ultrafast Phenomena 2022, Time-resolved Imaging of Transient Charge Transfer Dynamics, 20 Jul. 2022, 18 Jul. 2022 - 22 Jul. 2022

Felix Allum; Yoshiaki Kumagai; Kiyonobu Nagaya; James Harries; Hiroshi Iwayama; Akinobu Niozu; Mike Ashfold; Matthew Britton; Phillip Bucksbaum; Mark Brouard; Michael Bur; David Heathcote; Paul Hocke; Yusong Liu; Edwin Kukk; Jason Lee; Yusong Liu; Joseph McManus; Dennis Milesevic; Russell Minns; Johannes Niskannen; Andrew Orr-Ewing; Daniel Rolles; Artem Rudenko; Kiyoshi Ueda; James Unwin; Claire Vallance; Tiffany Walmsley; Ruaridh Forbes, Study of Dynamics by Light-Matter Interaction: From Atoms to Complex Systems, Ultrafast probing of charge transfer dynamics with an XUV free-electron laser, 11 Jun. 2022, 11 Jun. 2022 - 12 Jun. 2022

Y. Kumagai; T. Tsuchiya; M. Miyaushiro; Y. Terao; I. Suzuki; Y. Kanai; K. Kurose; M. Ukai; A. Yokoya; K. Fujii; Y. Fukuda; Y. Saitoh, The Physics Society of Japan 2022 Annual(77th) Meeting, Ion mass spectrometry for studying the radiation effect of aqueous molecules, 15 Mar. 2022, 15 Mar. 2022 - 19 Mar. 2022

09 Jan. 2022, 07 Jan. 2022 - 09 Jan. 2022

07 Jan. 2022, 07 Jan. 2022 - 09 Jan. 2022

Yoshiaki Kumagai; Masatoshi Ukai; Akinari Yokoya, Quantum Innovation 2021, Tracking radiation damage induction pathway following core-hole creation of DNA molecules in aqueous solution, 08 Dec. 2021, 07 Dec. 2021 - 09 Dec. 2021

Armin Kalita; Thomas F Kaldawi; Gabriel Blaj; Tetsuo Katayama; Koji Motomura; Yoshiaki Kumagai; Yiwen Li; Daehyun You; Taishi Ono; Tadashi Togashi; Shigeki Owada; Kensuke Tono; Makina Yabashi; Kiyoshi Ueda; Claudiu A Stan, 74th Annual Meeting of the APS Division of Fluid Dynamics, Measurements of microscale shock velocity in water droplets using optical imaging and ray tracing analysis, 21 Nov. 2021, 21 Nov. 2021 - 23 Nov. 2021

27 Oct. 2021, 26 Oct. 2021 - 28 Oct. 2021

27 Oct. 2021, 26 Oct. 2021 - 28 Oct. 2021

Y. Terao; Y. Kumagai; I. Suzuki; T. Tsuchiya; M. Ukai; A. Yokoya; K. Fujii; Y. Fukuda; Y. Saitoh, Study on radiation damaging intermediates of DNA by measuring x-ray induced luminescence, 20 Sep. 2021, 20 Sep. 2021 - 23 Sep. 2021

Y. Terao; Y. Kumagai; I. Suzuki; T. Tsuchiya; M. Ukai; A. Yokoya; K. Fujii; Y. Fukuda; Y. Saitoh, X-ray induced luminescence of hydrated nucleotide molecules, 07 Sep. 2021, 06 Sep. 2021 - 08 Sep. 2021

Yoshiaki Kumagai, XXXII International Conference on Photonic, Electronic and Atomic Collisions, Ultrafast electronic and nuclear dynamics in the nanoparticle induced the hard-x- ray laser, 22 Jul. 2021, 20 Jul. 2021 - 24 Jul. 2021

Linda Young; Gilles Doumy; Phay J. Ho; Anne Marie March; Stephen H. Southworth; Yoshiaki Kumagai; Andre Al Haddad; Ming-Feng Tu; Ludvig Kjellson; Jan-Erik Rubensson; Zhi Heng Loh; Tushar Debnath; Muhammad Shafiq Bin Mohd Yusof; Caroline Arnold; Robin Santra; William F. Schlotter; Stefan Moeller; Giacomo Cosolovich; Jake D Koralek; Michael P. Minitti; Marc Simon; ML Vidal; S Coriani; Kaushik D. Nanda; Anna I. Krylov, 51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, RIXS Reveals Hidden Electronic Transitions of the Aqueous OH Radical, Jun. 2020

Kaushik Nanda; Ludvig Kjellsson; Jan-Erik Rubensson; Gilles Doumy; Stephen Southworth; Phay J Ho; Anne M March; Andre Al Haddad; Yoshiaki Kumagai; Ming-Feng Tu; Muhammad Shafiq Mohd Yusof; Tushar Debnath; Caroline Arnold; Ralph Welsch; Ludger Inhester; Robin Santra; Marc Simon; William F Schlotter; Stefan Moeller; Giacomo Coslovich; Jake Korelek; Daniel DePonte; Zhi-Heng Loh; Anna Krylov; Linda Young, APS March Meeting 2020, RIXS within the coupled-cluster framework reveals the hidden transitions of transient species in ionized liquid water, Mar. 2020

12 Sep. 2019, False

05 Sep. 2019, False

Z.-H. Loh; P. J. Low; T. Debnath; M.S. Bin Mohd Yusof; G. Doumy; C. Arnold; L. Kjellsson; S. H. Southworth; A. Al Haddad; Y. Kumagai; M.-F. Tu; P. J. Ho; A. M. March; M. Simon; R. Welsch; L. Inhester; S. Moeller; G. Coslovich; J. Koralek; D. DePonte; W. F. Schlotter; J.-E. Rubensson; R. Santra; L. Young, FEMTO14, Capturing Transient Species in Ionized Liquid Water and Aqueous Solutions, 30 Jul. 2019, True

Akinobu Niozu; Yoshiaki Kumagai; Toshiyuki Nishiyama; Hironobu Fukuzawa; Koji Motomura; Max Bucher; Yuta Ito; Tsukasa Takanashi; Kazuki Asa; Yuhiro Sato; Daehyun You; Yiwen Li; Taishi Ono; Edwin Kukk; Catalin Miron; Liviu Neagu; Carlo Callegari; Michele Di Fraia; Giorgio Rossi; Davide Emilio Galli; Tommaso Pincelli; Alessandro Colombo; Takashi Kameshima; Yasumasa Joti; Takaki Hatsui; Shigeki Owada; Tetsuo Katayama; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Kazuhiro Matsuda; Christoph Bostedt; Kiyonobu Nagaya; Kiyoshi Ueda, ICPEAC2019, Characterizing crystalline defects in single Xe nanoparticles from angular correlations of single-shot diffracted X-rays, 29 Jul. 2019, True

Yoshiaki Kumagai; Takeshi Odagiri; Motoyoshi Nakano; Isao H Suzuki; Kouichi Hosaka; Masashi Kitajima; Noriyuki Kouchi, ICPEAC2019, Distribution of dipole oscillator strengths for the formation of excited hydrogen atom from C2H2, 26 Jul. 2019, True

L. Kjellsson; J.-E. Rubensson; G. Doumy; S. H. Southworth; P. J. Ho; A.M. March; A. Al Haddad; Y. Kumagai; M.-F. Tu; Z.-H. Loh; T. Debnath; M. Al-Shafiq; R. Santra; C. Arnold; R. Welsch; L. Inhester; M. Simon; W. F. Schlotter; S. Moeller; G. Coslovich; J. Koralek; D. DePonte; A. Krylov; K. Nanda; L. Young, The 40th International Conference on Vacuum Ultraviolet and X-ray Physics, Resonant Inelastic X-ray Scattering on Transient Hydroxyl Radicals in Liquid Water, 03 Jul. 2019, True

H. Fukuzawa; Y. Kumagai; Z. Jurek; W. Q. Xu; K. Motomura; D. Iablonski; K. Nagaya; S. Wada; T. Nishiyama; Y. Ito; S. Mondal; T. Tachibana; T. Sakai; K. Matsunami; T. Umemoto; T. Takanashi; S. Yamada; Y. Sakakibara; C. Nicolas; M. Patanen; J. Bozek; T. Bauer; M. Mucke; I. Dancus; M. Cernaianu; T. Togashi; K. Ogawa; S. Owada; K. Tono; M. Yabashi; E. Kukk; C. Miron; S.-K. Son; B. Ziaja; R. Santra; K. Ueda, HAXPES 2019, Time-Resolved Photoelectron And Ion Spectroscopy On XFEL-Induced Processes In Rare-Gas Clusters, 06 Jun. 2019, True

Yoshiaki Kumagai; Gilles Doumy; Anthony DiChiara; Tijana Rajh; Elena Shevchenko; Haidan Wen; Linda Young; Andre Al Haddad; Christoph Bostedt; Andreas Galler; Jan Offermann, 50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting, Femtosecond snapshots of nano crystalline response to XFEL pulse trains, May 2019

17 Mar. 2019, False

Sean O'Connell; Deepak Verma; Rico Mayro Tanyag; Weiwu Pang; Camila Bacellar; Catherine Saladrigas; Johannes Mahl; Benjamin Toulson; Yoshiaki Kumagai; Peter Walter; Christoph Bostedt; Oliver Gessner; Andrey Vilesov, APS March Meeting 2019, Vortex Lattice in Rotating Prolate 4He Droplets, Mar. 2019

Yoshiaki Kumagai, International workshop on science at x-ray free electron lasers: Chemical physics and materials science in extreme x-rays light and extreme fields, Electronic response during a pressure-induced phase transition in nanocrystals, 13 Feb. 2019, True

11 Jan. 2019, False

Yoshiaki Kumagai; Zoltan Jurek; Weiqing Xu; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Shin-ichi Wada; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Sang-Kil Son; Beata Ziaja; Robin Santra; Kiyoshi Ueda, The Fourteenth International Conference on Electronic Spectroscopy and Structure-14, Radiation-Induced Chemical Dynamics in Ar Clusters Exposed to Strong X-Ray Pulses, Oct. 2018, True

Yoshiaki Kumagai; Zoltan Jurek; Weiqing Xu; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Shin-ichi Wada; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Sang-Kil Son; Beata Ziaja; Robin Santra; Kiyoshi Ueda, The Fourteenth International Conference on Electronic Spectroscopy and Structure-14, Time-resolved study on XFEL-induced nanoplasma formation at SACLA, Oct. 2018

Sascha W. Epp; Masaki Hada; Yinpeng Zhong; Yoshiaki. Kumagai; Koji. Motomura; Shota Mizote; Taishi. Ono; Shigeki Owada; Danny Axford; Sadegh Bakhtiarzadeh; Hironobu Fukuzawa; Yasuhiko Hayashi; Tetsuo Katayama; Alexander Marx; Henrike M. Mueller-Werkmeister; Robin L. Owen; Darren Sherrell; Kensuke Tono; Kiyoshi Ueda; Fabian Westermeier; R. J; Dwayne Mi, The XXI International Conference on Ultrafast Phenomena, Differences in the ultrafast melting of bismuth and antimony, Sep. 2018, True

Ming-Feng Tu; Andre Al Haddad; Gilles Doumy; Stephen Southworth; Anne Marie March; Yoshiaki Kumagai; Donald Walko; Linda Young; Christoph Bostedt, 49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting, Micro-Focused Pink Beam For Time-Resolved X-Ray Emission Spectroscopy, May 2018, True

Yoshiaki Kumagai; Akinobu Niouzu; Phay Ho; Toshiyuki Nishiyama; Naomichi Yokono; Hironobu Fukuzawa; Tsukasa Takanashi; Daehyun You; Taishi Ono; Shigeki Owada; Ichiro Inoue; Akira Kon; Kensuke Tono; Makina Yabashi; Linda Young; Kiyoshi Ueda; Kiyonobu Nagaya; Christoph Bostedt, 49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting, Transient core structural dynamics at the solid-to-plasma transition of the cluster, May 2018, True

23 Mar. 2018, False

10 Jan. 2018, False

10 Jan. 2018, False

Michele Di Fraia; Enrico Allaria; C. Klaus Bartschat; Paolo Antonio Carpeggiani; Marcello Coreno; Riccardo Cucini; Giovanni De Ninno; Michele Devetta; Simone Di Mitri; Bruno Diviacco; Nicolas Douguet; Eugenio Ferrari; Paola Finetti; Andreas Fischer; David Gauthier; Luca Giannessi; Alexei N. Grum-Grzhimailo; Elena V. Gryzlova; Denys Iablonskyi; Jochen Küpper; Yoshiaki Kumagai; Victor Lyamayev; Nicola Mahne; Tommaso Mazza; Michael Meyer; Thomas Möller; Matteo Negro; Yevheniy Ovcharenko; Giuseppe Penco; Oksana Plekan; Lorenzo Raimondi; Ribic Primoz Rebernik; Maurizio Reduzzi; Robert Richter; Eleonore Lucie Roussel; Giuseppe Sansone; Cristian Svetina; Frank Stienkemeier; Svetlana I. Strakhova; Tsukasa Takanashi; Mauro Trovò; Sebastian Trippel; Kiyoshi Ueda; Caterina Vozzi; Joel Venzke; Joss Wiese; Marco Zangrando; Kevin Charles Prince; Carlo Callegari, FisMat2017, Time-resolved and imaging techniques at the Low Density Matter Beamline @ FERMI, Oct. 2017, True

Toshiyuki Nishiyama; Yoshiaki Kumagai; Akinobu Niozu; Hironobu Fukuzawa; Koji Motomura; Max Bucher; Yuta Ito; Tsukasa Takanashi; Kazuki Asa; Yuhiro Sato; Daehyun You; Yiwen Li; Taishi Ono; Edwin Kukk; Catalin Miron; Liviu Neagu; Carlo Callegari; Michele Fraia; Giorgio Rossi; Davide Galli; Tommaso Pincelli; Alessandro Colombo; Sigeki Owada; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Kazuhiro Matsuda; Christoph Bostedt; Kiyonobu Nagaya; Kiyoshi Ueda, The 30th International Conference on Photonic, Electronic and Atomic Collisions,, Time-resolved wide-angle x-ray scattering measurements of Xe clusters by XFEL pulses, Jul. 2017, True

Yuta Abe; Takeshi Odagiri; Takuro Taniguchi; Takahisa Shiratori; Masashi Kaida; Kazufumi Yachi; Yoshiaki Kumagai; Koichi Hosaka; Masashi Kitajima; Noriyuki Kouchi, The 30th International Conference on Photonic, Electronic and Atomic Collisions, Cross sections for the formation of H(2p) atom via doubly excited states in photoexcitation of rotationally cold H2, Jul. 2017, True

Yoshiaki Kumagai; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Sin-ichi Wada; Yuta Ito; Tsukasa Takanashi; Yuta. Sakakibara; Daehyun You; Toshiyuki Nishiyama; Kazuki Asa; Yuhiro Sato; Takayuki Umemoto; Kango Kariyazono; Edwin. Kukk; Kuno Kooser; Christophe Nicolas; Catalin Miron; Theodor Asave; Liviu Neagu; Markus S. Schöffler; Gregor Kastirke; Xiao-Jing Liu; Shigeki Owada; Tetsuo Katayama; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Kirill Gokhberg; Lorenz S. Cederbaum; Alexander I. Kuleff; Kiyoshi Ueda, The 30th International Conference on Photonic, Electronic and Atomic Collisions, Nanoplasma formed by an ultrashort hard x-ray pulse in Xe clusters, Jul. 2017, True

Tsukasa Takanashi; Hironobu Fukuzawa; Koji Motomura; Kiyonobu Nagaya; Sin-ichi Wada; Yoshiaki Kumagai; Denys Iablonskyi; Subhendu Mondal; Yuta Ito; Tetsuya Tachibana; Syuhei Yamada; Yuta Sakakibara; Daehyun You; Toshiyuki Nishiyama; Kenji Matsunami; Tsukasa Sakai; Kazuki Asa; Yuhiro Sato; Takayuki Umemoto; Kango Kariyazono; Yusuke Takahashi; Manabu Kanno; Kousuke Nakamura; Kaoru Yamazaki; Shinji Kajimoto; Hikaru Sotome; Edwin Kukk; Kuno Kooser; Christophe Nicolas; Catalin Miron; Markus S. Schöffler; Gregor Kastirke; Per Johnsson; Theodor Asavei; Liviu Neagu; Xiao-Jing. Liu; Serguei Molodtsov; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Tadashi Katayama; Kensuke Tono; Makina Yabashi; Artem Rudenko; Hiroshi Fukumura; Makoto Yao; Hirohiko Kono; Kiyoshi Ueda, The 30th International Conference on Photonic, Electronic and Atomic Collisions, Real Time Observation of the Ultrafast Dynamics Induced by XFEL Pulses in CH2I2 Molecule, Jul. 2017, True

Maximilian Bucher; Phay Ho; Ken R. Ferguson; Tais Gorkhover; Agostino Marinelli; Daniela Rupp; O. Gessner; A. Vilesov; D. Rolles; Artem Rudenko; Kionobu Nagaya; Yoshiaki Kumagai; Kiyoshi Ueda; Linda Young; Thomas Möller; Christoph Bostedt, European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference, Ultrafast imaging of transient states and non-equilibrium dynamics in clusters with x-ray laser based pump-probe techniques, Jun. 2017, True

Tsukasa Takanashi; Hironobu Fukuzawa; Koji Motomura; Kiyonobu Nagaya; Sin-ichi Wada; Yoshiaki Kumagai; Denys Iablonskyi; Subhendu Mondal; Yuta Ito; Tetsuya Tachibana; Syuhei Yamada; Yuta Sakakibara; Daehyun You; Toshiyuki Nishiyama; Kenji Matsunami; Tsukasa Sakai; Kazuki Asa; Yuhiro Sato; Takayuki Umemoto; Kango Kariyazono; Yusuke Takahashi; Manabu Kanno; Kousuke Nakamura; Kaoru Yamazaki; Shinji Kajimoto; Hikaru Sotome; Edwin Kukk; Kuno Kooser; Christophe Nicolas; Catalin Miron; Markus S. Schöffler; Gregor Kastirke; Per Johnsson; Theodor Asavei; Liviu Neagu; Xiao-Jing Liu; Serguei Molodtsov; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Tetsuo Katayama; Kensuke Tono; Makina Yabashi; Artem Rudenko; Hiroshi Fukumura; Makoto Yao; Hirohiko Kono; Kiyoshi Ueda, International Workshop on Photoionization & Resonant Inelastic X-ray Scattering, Time-Resolved Observation of XFEL Induced Dynamics in CH2I2 Molecule, Mar. 2017, True

Yoshiaki Kumagai; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Sin-ichi Wada; Yuta Ito; Tsukasa Takanashi; Yuta. Sakakibara; Daehyun You; Toshiyuki Nishiyama; Kazuki Asa; Yuhiro Sato; Takayuki Umemoto; Kango Kariyazono; Edwin Kukk; Kuno Kooser; Christophe Nicolas; Catalin Miron; Theodor Asave; Liviu Neagu; Markus S. Schöffler; Gregor Kastirke; Xiao-Jing Liu; Shigeki Owada; Tetsuo Katayama; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Kirill Gokhberg; Lorenz S. Cederbaum; Alexander I. Kuleff; Kiyoshi Ueda, nternational Workshop on Photoionization & Resonant Inelastic X-ray Scattering, Nanoplasma produced by a femtosecond hard-x-ray laser pulse in xenon clusters, Mar. 2017, True

enrike M; Müller- Werkmeister; Helen M. Ginn; Anling Kuo; Antoine Sarracini; Helen Duyvesteyn; Sascha W. Epp; Darren Sherrell; Danny Axford; Shigeki Owada; Olivier Pare- Labrosse; Saeed Oghbaey; Jessica Besaw; Zeinab Eskandarian; Masaki Hada; Yoshiaki Kumagai; Kensuke Tono; Eike C. Schulz; Pedram Mehrabi; Yinpeng Zhong; Koji Motomura; Bryan T. Eger; Alexander Marx; Emil F. Pai; Arwen R. Pearson; Robin L. Owen; Kiyoshi Ueda; David I. Stuart; Oliver P. Ernst; R. J; Dwayne Mi, 5th BANFF Meeting on Structural Dynamics, Femtosecond Time-Resolved Ligand Dynamics in Myoglobin under low excitation conditions observed with an XFEL, Feb. 2017

Yoshiaki Kumagai; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Sin-ichi Wada; Yuta Ito; Tsukasa Takanashi; Yuta Sakakibara; Daehyun You; Toshiyuki Nishiyama; Kazuki Asa; Yuhiro Sato; Makoto Yao; Takayuki Umemoto; Kango Kariyazono; Edwin Kukk; Kuno. Koser; Christophe Nicolas; Catalin Miron; Theodor Asavei; Liviu Neagu; Markus S. Schöffler; Gregor Kastirke; Xiao-Jing Liu; Shigeki Owada; Tetsuo Katayama; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Kirill Gokhberg; Alexander I. Kuleff; Lorenz S. Cederbaum; Kiyoshi Ueda, International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces 2016, Femtosecond real-time study on nanoplasma formation in xenon cluster by XFEL pulses at SACLA, Aug. 2016, True

Michele Di Fraia; Enrico Allaria; Riccardo Cucini; Giovanni De Ninno; Simone Di Mitri; Bruno Diviacco; Eugenio Ferrari; Paola Finetti; David Gauthier; Luca Giannessi; Nicola Mahne; Giuseppe Penco; Oksana Plekan; Lorenzo Raimondi; Ribic Primoz Rebernik; Robert Richter; Eleonore Lucie Roussel; Cristian Svetina; Mauro Trovò; Marco Zangrando; Michele Devetta; Matteo Negro; Paolo Antonio Carpeggiani; Maurizio Reduzzi; Giuseppe Sansone; Caterina Vozzi; Alexei N. Grum-Grzhimailo; Elena V. Gryzlova; Svetlana I; Strakhova; Joss Wiese; Jochen Kuepper; C. Klaus Bartschat; Nicolas Douguet; Joel Venzke; Denys Iablonskyi; Yoshiaki Kumagai; Tsukasa Takanashi; Kiyoshi Ueda; Andreas Fischer; Marcello Coreno; Frank Stienkemeier; Victor Lyamayev; Yevheniy Ovcharenko; Tommaso Mazza; Thomas Möller; Michael Meyer; Kevin Charles Prince; Carlo Callegari, Advanced Particle Imaging Techniques conference, Time-resolved and imaging techniques at the Low Density Matter Beamline @ FERMI, Aug. 2016, True

Michele Di Fraia; Enrico Allaria; Riccardo Cucini; Giovanni De Ninno; Simone Di Mitri; Bruno Diviacco; Eugenio Ferrari; Paola Finetti; David Gauthier; Luca Giannessi; Nicola Mahne; Giuseppe Penco; Oksana Plekan; Lorenzo Raimondi; Ribic Primoz Rebernik; Robert Richter; Eleonore Lucie Roussel; Cristian Svetina; Mauro Trovò; Marco Zangrando; Michele Devetta; Matteo Negro; Paolo Antonio Carpeggiani; Maurizio Reduzzi; Giuseppe Sansone; Caterina Vozzi; Alexei N; Grum- Grzhimailo; Elena V. Gryzlova; Svetlana I; Strakhova; Joss Wiese; Jochen Kuepper; C. Klaus Bartschat; Nicolas Douguet; Joel Venzke; Denys Iablonskyi; Yoshiaki Kumagai; Tsukasa Takanashi; Kiyoshi Ueda; Andreas Fischer; Marcello Coreno; Frank Stienkemeier; Victor Lyamayev; Yevheniy Ovcharenko; Tommaso Mazza; Thomas Möller; Michael Meyer; Kevin Charles Prince; Carlo Callegari, Advanced Particle Imaging Techniques conference, Time-resolved and imaging techniques at the Low Density Matter Beamline at FERMI, Aug. 2016

Thomas J. Penfold; Jakub Szlachetko; Wojciech Gawelda; Fabio G. Santomauro; Alexander Britz; Tim B. van Driel; Leonardo Sala; Simon Ebner; Steve H. Southworth; Gilles Doumy; Anne Marie March; Carl S. Lehmann; Tetsuo Katayama; Melanie Mucke; Denis Iablonskyi; Yoshiaki Kumagai; Gregor Knopp; Koji Motomura; Tadashi Togashi; Shigeki Owada; Makina Yabashi; Jochen Rittmann; Martin M. Nielsen; Marek Pajek; Kiyoshi Ueda; Majed Chergui; Rafael Abela; Christopher J. Milne, International Conference on Ultrafast Phenomena, Femtosecond X-ray Absorption and Emission Spectroscopy on ZnO Nanoparticles in Solution, Jul. 2016, True

Yoshiaki Kumagai; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Sin-ichi Wada; Yuta Ito; Tsukasa Takanashi; Yuta Sakakibara; Daehyun You; Toshiyuki Nishiyama; Kazuki Asa; Yuhiro Sato; Takayuki Umemoto; Kango Kariyazono; Edwin Kukk; Kuno. Koser; Christophe Nicolas; Catalin Miron; Theodor Asavei; Liviu Neagu; Markus S. Schöffler; Gregor Kastirke; Xiao-Jing Liu; Shigeki Owada; Tetsuo Katayama; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Makoto Yao; Kiyoshi Ueda, International Conference on Ultrafast Phenomena 2016, Femtosecond Time-resolved Study on Nanoplasma Dynamics of Xenon Clusters Irradiated with High Intensity Hard X-rays at SACLA, Jul. 2016, True

Yoshiaki Kumagai; Weiqing Xu; Zoltan Jurek; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Shin-ichi Wada; Subhendu Mondal; Tetsuya Tachiban; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Sang-Kil Son; Beata Ziaja; Makoto Yao; Robin Santra; Kiyoshi Ueda, 39th International conference on Vacuum Ultraviolet and X-ray Physics, Time-resolved study of Ar nanoplasma induced by XFEL pulses, Jun. 2016, True

Yoshiaki Kumagai; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Kiyonobu Nagaya; Sin-ichi Wada; Yuta Ito; Tsukasa Takanashi; Yuta Sakakibara; Daehyun You; Toshiyuki Nishiyama; Kazuki Asa; Yuhiro Sato; Takayuki Umemoto; Kango Kariyazono; Edwin Kukk; Kuno. Koser; Christophe Nicolas; Catalin Miron; Theodor Asavei; Liviu Neagu; Markus S. Schöffler; Gregor Kastirke; Xiao-Jing Liu; Shigeki Owada; Tetsuo Katayama; Tadashi Togashi; Kensuke Tono; Makina Yabashi; Makoto Yao; Kiyoshi Ueda, 39th International conference on Vacuum Ultraviolet and X-ray Physics, Femtosecond time-resolved study of nanoplasma formation in Xe clusters irradiated by XFEL pulses, Jun. 2016, True

Christoph Bostedt; Ken R. Ferguson; Tais Gorkhover; Philip H. Bucksbaum; Sébastien Boutet; Jason E. Koglin; Alberto Lutman; Agostino Marinelli; Jim Turner; Maximilian Bucher; Phay J. Ho; Christopher Knight; Linda Young; Hironobu Fukuzawa; Yoshiaki Kumagai; Kiyoshi Ueda; Kiyonobu Nagaya; Marc Messerschmidt; Garth J. Williams, 47th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, Transient lattice contraction in the solid to plasma transition of x-ray heated xenon, May 2016

Paolo Antonio Carpeggiani; Giuseppe Sansone; Maurizio Reduzzi; Alexei N. Grum-Grzhimailo; Elena V. Gryzlova; Svetlana I. Strakhova; C. Klaus Bartschat; Denys Iablonskyi; Yoshiaki Kumagai; Tsukasa Takanashi; Kiyoshi Ueda; Andreas Fischer; Frank Stienkemeier; Tommaso Mazza; Michael Meyer; Enrico Allaria; Carlo Callegari; Riccardo Cucini; Giovanni De Ninno; Simone Di Mitri; Bruno Diviacco; Eugenio Ferrari; Paola Finetti; David Gauthier; Luca Giannessi; Nicola Mahne; Giuseppe Penco; Oksana Plekan; Lorenzo Raimondi; Ribic Primoz Rebernik; Eleonore Lucie Roussel; Cristian Svetina; Mauro Trovò; Marco Zangrando; Kevin Charles Prince, FisMat2015, Coherent control in the extreme ultraviolet spectral range using the Free Electron Laser FERMI@Elettra, Sep. 2015, True

Thomas J. Penfold; Jakub Szlachetko; Wojciech Gawelda; Fabio G. Santomauro; Alexander Britz; Tim Brandt; van Driel; Leonardo Sala; Simon Ebner; Stephen H. Southworth; Gilles Doumy; Anne Marie March; Carl S. Lehmann; Tetsuo Katayama; Melanie Mucke; Denys Iablonskyi; Yoshiaki Kumgai; Gregor Knopp; Koji Motomura; Tadashi Togashi; Shigeki Owada; Makina Yabashi; Jochen Rittmann; Martin M. Neelsen; Marek Pajek; Kiyoshi Ueda; Majed Chergui; Rafael Abela; Christopher J. Milne, 16th international conference on X-ray Absorption Fine Structure, Revealing charge carrier trapping in ZnO with femtosecond time-resolved X-ray spectroscopy, Aug. 2015, True

Tsukasa Takanashi; Hironobu Fukuzawa; Koji Motomura; Denys Iablonskyi; Yoshiaki Kumagai; Subhendu Mondal; Tetsuya Tachibana; Toshiyuki Nishiyama; Kenji Matsunami; Kiyonobu Nagaya; Per Johnsson; Paolo Piseri; Giuseppe Sansone; Antoine Dubrouil; Maurizio Reduzzi; Paolo Carpeggiani; Caterina Vozzi; Michele Devetta; Matteo Negro; Davide Faccialà; Francesca Calegari; Andrea Trabattoni; Mattea Carmen Castrovilli; Yevheniy Ovcharenko; Marcel Mudrich; Frank Stienkemeier; Marcello Coreno; Michele Alagia, Be; Schütte; Nora Berrah; Carlo Callegari; Oksana Plekan; Paola Finetti; Luca Giannessi; Carlo Spezzani; Eugenio Ferrari; Enrico Allaria; Giuseppe Penco; Claudio Serpico; Giovanni De Ninno; Bruno Diviacco; Simone Di Mitri; Kevin Charles Prince; Makoto Yao; Nikolay V. Golubev; Philipp. V. Demekhin; Lorenz S. Cederbaum; Alexander I. Kuleff; Kiyoshi Ueda, Intense field, Short Wavelength Atomic and Molecular Processes-3,, XUV pump-UV prove measurement of the interatomic Coulombic decay process induced by two-photon double excitation in Ne2, Jul. 2015, True

Paolo Antonio Carpeggiani; Giuseppe Sansone; Maurizio Reduzzi; Alexei N. Grum-Grzhimailo; Elena V. Gryzlova; Svetlana I. Strakhova; C. Klaus Bartschat; Denys Iablonskyi; Yoshiaki Kumagai; Tsukasa Takanashi; Kiyoshi Ueda; Andreas Fischer; Frank Stienkemeier; Tommaso Mazza; Michael Meyer; Enrico Allaria; Carlo Callegari; Riccardo Cucini; Giovanni De Ninno; Simone Di Mitri; Bruno Diviacco; Eugenio Ferrari; Paola Finetti; David Gauthier; Luca Giannessi; Nicola Mahne; Giuseppe Penco; Oksana Plekan; Lorenzo Raimondi; Ribic Primoz Rebernik; Eleonore Lucie Roussel; Cristian Svetina; Mauro Trovò; Marco Zangrando; Kevin Charles Prince, 5th International Conference on Attosecond Physics, Coherent control in the extreme ultraviolet spectral range using the Free Electron Laser FERMI@Elettr, Jul. 2015, True

Kouichi Hosaka; Yuko Nakanishi; Ryoko Kogo; Philipp Schmidt; Yutaro Torizuka; Keisuke Shigemura; Takeshi Odagiri; Andre Knie; Kari Jankala; Arno Ehresmann; Motoyoshi Nakano; Yoshiaki Kumagai; Ken-Ichi Shiino; Masashi Kitajima; Noriyuki Kouchi, The 29th International Conference on Photonic, Electronic and Atomic Collisions, Angular correlation measurements of a pair of Lyman-α photons emitted in the photodissociation of H2, Jul. 2015, True

Denys Iablonskyi; Kiyonobu Nagaya; Hironobu Fukuzawa; Koji Motomura; Yoshiaki Kumagai; Subhendu Mondal; Tetsuya Tachibana; Tsukasa Takanashi; Toshiyuki Nishiyama; Kenji Matsunami; Per Johnsson; Paolo Piseri; Giuseppe Sansone; Antoine Dubrouil; Maurizio Reduzzi; Paolo Carpeggiani; Caterina Vozzi; Michele Devetta; Matteo Negro; Davide Faccialà; Francesca Calegari; Andrea Trabattoni; Mattea Carmen Castrovilli; Yevheniy Ovcharenko; Thomas Möller; Marcel Mudrich; Frank Stienkemeier; Marcello Coreno; Michele Alagia, Be; Schütte; Nora Berrah; Carlo Callegari; Oksana Plekan; Paola Finetti; Carlo Spezzani; Eugenio Ferrari; Enrico Allaria; Giuseppe Penco; Claudio Serpico; Giovanni De Ninno; Bruno Diviacco; Simone Di Mitri; Luca Giannessi; Kevin Charles Prince; Makoto Yao; Kiyoshi Ueda, The 29th International Conference on Photonic, Electronic and Atomic Collisions, Interatomic Coulombic Decay Processes after Multiple Valence Excitations in Ne Clusters, Jul. 2015, True

Yoshiaki Kumagai, Intense field, Short Wavelength Atomic and Molecular Processes-3, Time-resolved study on XFEL-induced nanoplasma formation at SACLA, Jul. 2015, Hamburg, True

Thomas J. Penfold; Jakub Szlachetko; Wojciech Gawelda; Fabio G. Santomauro; Alexander Britz; Tim Brandt; van Driel; Leonardo Sala; Simon Ebner; Stephen H. Southworth; Gilles Doumy; Anne Marie March; Carl S. Lehmann; Tetsuo Katayama; Melanie Mucke; Denys Iablonskyi; Yoshiaki Kumgai; Gregor Knopp; Koji Motomura; Tadashi Togashi; Shigeki Owada; Makina Yabashi; Jochen Rittmann; Martin M. Neelsen; Marek Pajek; Kiyoshi Ueda; Majed Chergui; Rafael Abela; Christopher J. Milne, 3rd International Conference on Ultrafast Structural Dynamics, Revealing Charge Carrier Trapping in ZnO Nanoparticles With Femtosecond Time-Resolved X-ray Spectroscopy, Jun. 2015, True

Kiyoshi. Ueda; Yoshiaki Kumagai; Weiqing Xu; Hironobu Fukuzawa; Koji Motomura; Kiyonobu Nagaya; Sin-ichi Wada; Denys Iablonski; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Makoto Yao, 4th Ultrafast Dynamic Imaging of Matter Conference, Time-resolved study on XFEL-induced nanoplasma formation at SACLA, Mar. 2015, True

Weiqing Xu; Yoshiaki Kumagai; Hironobu Fukuzawa; Koji Motomura; Kiyonobu. Nagaya; Shin-ichi Wada; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Zoltan Jurek; Beata Ziaja; Makoto Yao; Robin Santra; Kiyoshi Ueda, 11th Asian International Seminar on Atomic and Molecular Physics, Plasmon resonance heating and recombination of argon nanoplasma produced by x-ray free-electron laser pulses, Oct. 2014, True

Yoshiaki Kumagai, 11th Asian International Seminar on Atomic and Molecular Physics, Real-time study of plasmon resonance heating of xenon nanoplasma produced by XFEL pulses at SACLA, Oct. 2014, Sendai, True

Weiqing Xu; Yoshiaki Kumagai; Hironobu Fukuzawa; Koji Motomura; Kiyonobu. Nagaya; Shin-ichi Wada; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Zoltan Jurek; Beata Ziaja; Robin Santra; Makoto Yao; Kiyoshi Ueda, International Workshop on Photoionization and Resonant Inelastic X-Ray Scattering, Plasmon resonant heating and recombination of argon nanoplasma produced by X-ray free-electron laser pulses, Aug. 2014, True

Yoshiaki Kumagai; Weiqing Xu; Hironobu Fukuzawa; Koji Motomura; Kiyonobu. Nagaya; Shin-ichi Wada; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Makoto Yao; Kiyoshi Ueda, International Workshop on Photoionization and Resonant Inelastic X-Ray Scattering, Real-time study of the ultrafast plasmon resonance heating in the nanoplasma produced by XFEL irradiation in Xe clusters at SACLA, Aug. 2014, True

Weiqing Xu; Yoshiaki Kumagai; Hironobu Fukuzawa; Koji Motomura; Kiyonobu. Nagaya; Shin-ichi Wada; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Zoltan Jurek; Beata Ziaja; Robin Santra; Makoto Yao; Kiyoshi Ueda, International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces 2014, Plasmon resonance heating and recombination of argon nanoplasma produced by x-ray free-electron laser pulses, Jul. 2014, True

Yoshiaki Kumagai; Weiqing Xu; Hironobu Fukuzawa; Koji Motomura; Kiyonobu. Nagaya; Shin-ichi Wada; Subhendu Mondal; Tetsuya Tachibana; Yuta Ito; Tsukasa Sakai; Kenji Matsunami; Toshiyuki Nishiyama; Takayuki Umemoto; Christophe Nicolas; Catalin Miron; Tadashi Togashi; Kanade Ogawa; Shigeki Owada; Kensuke Tono; Makina Yabashi; Makoto Yao; Kiyoshi Ueda, International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces 2014, Probing in real time the ultrafast plasmon resonance heating in the nanoplasma produced by XFEL irradiation in Xe clusters at SACLA, Jul. 2014, True

Yoshiaki Kumagai; Takeshi Odagiri; Takehiko Tanabe; Motoyoshi Nakano; Isao H Suzuki; Noriyuki Kouchi, The 27th International Conference on Photonic, Electronic and Atomic Collisions, Metastable hydrogen in the 2s state as a probe for dissociative doubly excited states of molecules, Jul. 2011, True

Takeshi Odagiri; Yoshiaki Kumagai; Takehiko Tanabe; Motoyoshi Nakano; Isao H Suzuki; Noriyuki Kouchi, The 26th International Conference on Photonic, Electronic 9 and Atomic Collisions, Symmetry-resolved spectroscopy by detection of a metastable hydrogen atom for investigating the doubly excited states of molecular hydrogen, Jul. 2009, True

Takeshi Odagiri; Motoyoshi Nakano; Takehiko Tanabe; Yoshiaki Kumagai; Isao H Suzuki; Noriyuki Kouchi, The 26th International Conference on Photonic, Electronic and Atomic Collisions, Generation of a pair of photons through the three-body dissociation of a multiply excited water molecule around the double ionization potential, Jul. 2009, True

Sep. 2022

Apr. 2022

Jun. 2013

Jun. 2011