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Your search keyword '"Kiyoshi Ueda"' showing total 13 results
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13 results on '"Kiyoshi Ueda"'

1. Femtosecond X-ray Absorption and Emission Spectroscopy on ZnO Nanoparticles in Solution

Author

Rafael Abela, Tetsuo Katayama, Thomas J. Penfold, Gregor Knopp, C. S. Lehmann, Fabio G. Santomauro, Melanie Mucke, Shigeki Owada, Simon Ebner, Makina Yabashi, Denis Iablonskyi, Alexander Britz, Yoshiaki Kumagai, Koji Motomura, Christopher J. Milne, Stephen H. Southworth, Jakub Szlachetko, Anne Marie March, J. Rittmann, Leonardo Sala, M. Pajek, Wojciech Gawelda, Tadashi Togashi, Tim Brandt van Driel, Majed Chergui, Gilles Doumy, Martin Nielsen, and Kiyoshi Ueda

Subjects
Photoexcitation, X-ray spectroscopy, Chemistry, Femtosecond, Analytical chemistry, X-ray, Nanoparticle, Emission spectrum, Spectroscopy, Absorption (electromagnetic radiation)
Abstract

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.

Published
2016
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3. Femtosecond Time-resolved Study on Nanoplasma Dynamics of Xenon Clusters Irradiated with High Intensity Hard X-rays at SACL

Author

Kuno Kooser, Shin-ich Wada, Yuta Sakakibara, Catalin Miron, Mingfa Yao, Markus Schöffler, Makina Yabashi, Tadashi Togashi, Kazuki Asa, Theodor Asavei, Kango Kariyazono, Denis Iablonskyi, Kiyoshi Ueda, Yoshiaki Kumagai, Liviu Neagu, Y. Sato, Hironobu Fukuzawa, Daehyun You, Christophe Nicolas, Tsukasa Takanashi, Takayuki Umemoto, Koji Motomura, Edwin Kukk, Tetsuo Katayama, Yuta Ito, Toshiyuki Nishiyama, Kensuke Tono, Kiyonobu Nagaya, G. Kastirke, Shigeki Owada, and Xiao-Jing Liu

Subjects
SACLA, Materials science, Xenon, chemistry, High intensity, Hard X-rays, Femtosecond, Dynamics (mechanics), chemistry.chemical_element, Irradiation, Atomic physics
Published
2016
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4. Two-Step Explosion Dynamics of Highly Charged Fullerene Cations C60q+ (q = 20‒60)

Author

Hirohiko Kono, Manabu Kanno, Takashi Nakamura, Naoyuki Niitsu, Kaoru Yamazaki, and Kiyoshi Ueda

Subjects
Fullerene, Chemical physics, Chemistry, Ionization, Thermal, Dynamics (mechanics), Two step, Coulomb, Molecule, Atomic physics, Ion
Abstract

C60q+ (q = 20-60) firstly ejects fast atomic cations Cz+ (z ≥ 1) via Coulomb explosions on a 10 fs timescale. Thermal evaporations of slow atomic and molecular fragments subsequently occur in 100–1000 fs.

Published
2014
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5. Photoelectron Angular Distributions in EUV+IR Two-Color Near-Threshold Ionization of Ne and He

Author

S. Mondal, Shin-ichi Wada, S. Yase, Koji Motomura, Kenichi L. Ishikawa, K. Matsunami, Nikolay M. Kabachnik, Lorenzo Avaldi, Carlo Callegari, H. Hayashita, Kiyoshi Ueda, Makina Yabashi, Norio Saito, Mitsuru Nagasono, Hironobu Fukuzawa, Patrick O'Keeffe, Mingfa Yao, Tadashi Togashi, Catalin Miron, Andrey K. Kazansky, T. Sakai, Kiyonobu Nagaya, Tetsuya Tachibana, Paola Bolognesi, and Kevin C. Prince

Subjects
Photon, Physics::Instrumentation and Detectors, Chemistry, Extreme ultraviolet lithography, Ir laser, Physics::Optics, Atmospheric-pressure laser ionization, Near threshold, symbols.namesake, Excited state, Ionization, Physics::Atomic and Molecular Clusters, Rydberg formula, symbols, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Physics::Atomic Physics, Atomic physics
Abstract

Photoelectron angular distributions (PADs) dependence on the time-delay between EUV-FEL and IR laser pulses is observed for ionization of Ne. PADs for Rydberg excited oneand two-IR photon above-threshold ionization of He are measured. Ultrafast Phenomena 2014 © 2014 OSA.

Published
2014
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6. Multiphoton Multiple Ionization of Rare-Gas Atoms and Clusters by X-Ray Free-Electron Laser Pulses from SACLA

Author

Benedikt Rudek, T. Sakai, Koji Motomura, Mingfa Yao, Kiyonobu Nagaya, Xiao-Jing Liu, Makina Yabashi, Sang-Kil Son, H. Hayashita, Edwin Kukk, S. Mondal, M. Siano, Zoltan Jurek, Robin Santra, Beata Ziaja, Catalin Miron, Shin-ichi Wada, Tetsuya Tachibana, Kiyoshi Ueda, Kensuke Tono, Benjamin Erk, Hironobu Fukuzawa, Takaki Hatsui, Lutz Foucar, Yuichi Inubushi, Per Johnsson, K. Matsunami, Raimund Feifel, E. Robert, Jonathan P. Marangos, Jumpei Kajikawa, Yuta Ito, and M. Kimura

Subjects
Materials science, Astrophysics::High Energy Astrophysical Phenomena, X-ray, Free-electron laser, Electron, Laser, Molecular physics, Photon counting, Atmospheric-pressure laser ionization, law.invention, SACLA, law, Ionization, Physics::Atomic and Molecular Clusters, Physics::Accelerator Physics, Physics::Atomic Physics, Atomic physics
Abstract

We have investigated multiphoton multiple ionization dynamics of rare-gas atoms and clusters by 5 keV and 5.5 keV x-ray free-electron laser (XFEL) pulses provided by a new XFEL facility, SACLA in Japan.

Published
2014
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7. Charge Migration and Molecular Dissociation Following Multiphoton Multiple Ionization of Iodine-Substitute Molecules by X-Ray Free-Electron Laser Pulses from SACLA

Author

Edwin Kukk, Catalin Miron, Kensuke Tono, Satoshi Ohmura, R. Koga, Jianhui Chen, K. Matsunami, Anand Mailam, Kiyonobu Nagaya, Yuhai Jiang, Takaki Hatsui, Dong Eon Kim, Hironobu Fukuzawa, Yuta Ito, Artem Rudenko, Christophe Nicolas, Yizhu Zhang, Tetsuya Tachibana, Yuichi Inubushi, Kiyoshi Ueda, S. Mondal, Hirohiko Kono, Shin-ichi Wada, Makina Yabashi, Koji Motomura, T. Sakai, Xiao-Jing Liu, and Mingfa Yao

Subjects
SACLA, Fragmentation (mass spectrometry), Chemistry, Ionization, X-ray, Free-electron laser, Molecule, Atomic physics, Molecular physics, Dissociation (chemistry), Ion
Abstract

We have studied charge migration and dissociation in iodine-contained molecules using XFEL from SACLA and applying the ion momentum coincidence technique to fragmentation of highly charged molecular ions produced via XFEL at the iodine site.

Published
2014
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8. Laser induced rescattering photoelectron spectroscopy of CO2 molecule

Author

Misaki Okunishi, Oleg I. Tolstikhin, Robert R. Lucchese, Yuta Ito, Lars Bojer Madsen, Vandana Sharma, Kiyoshi Ueda, and Toru Morishita

Subjects
Physics, Physics::Optics, Electron, Laser, Molecular physics, Spectral line, law.invention, X-ray photoelectron spectroscopy, law, Electric field, Temporal resolution, Molecule, Physics::Atomic Physics, Atomic physics, Electron scattering, Physics::Atmospheric and Oceanic Physics
Abstract

We have measured rescattering photoelectron spectra of CO2 induced by ultrashort intense laser pulses at 1250 and 1300 nm and extracted field-free differential cross sections of electron scattering from CO2 + from the spectra.

Published
2014
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9. Investigation on Dynamics of Nano-Plasma of Rare-Gas Clusters by EUVFEL Pump – NIR Laser Probe Measurements

Author

Mingfa Yao, Makina Yabashi, Toshiyuki Nishiyama, S. Yase, Hironobu Fukuzawa, Kiyoshi Ueda, Koji Motomura, Mitsuru Nagasono, H. Hayashita, Tetsuya Tachibana, Kiyonobu Nagaya, K. Matsunami, Shin-ichi Wada, Norio Saito, T. Sakai, Tadashi Togashi, and S. Mondal

Subjects
Rare gas, Chemistry, business.industry, Far-infrared laser, technology, industry, and agriculture, Free-electron laser, Physics::Optics, Astrophysics::Cosmology and Extragalactic Astrophysics, Plasma, Ion, Extreme ultraviolet, Nano, Optoelectronics, Atomic physics, Nir laser, business, Astrophysics::Galaxy Astrophysics
Abstract

Via extreme ultraviolet free electron laser pump and near infrared laser probe experiments for rare-gas clusters, we found clear enhancement of highly charged ions when EUVFEL and NIR pulses overlap, indicating efficient heating of nano-plasma.

Published
2014
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10. Mapping Electronic States and Associated Dynamics of Non-Linearly Ionized Atoms and Molecules

Author

Peter van der Meulen, J. Grilj, Melanie Mucke, Raimund Feifel, Robert Richter, Ryan Coffee, Li Fang, Maria Novella Piancastelli, John H. D. Eland, Brian K. McFarland, Marc Messerschmidt, Richard D. Thomas, Nora Berrah, M. Koch, M. Glownia, Shin-ichi Wada, Vitali Zhaunerchyk, James P. Cryan, Richard J. Squibb, Lutz Foucar, John D. Bozek, Timur Osipov, P. Linusson, Peter Salén, S. Schorb, Magdalena Kaminska, Koji Motomura, Brendan Murphy, Christoph Bostedt, Markus Gühr, Kevin C. Prince, E. F. Sistrunk, Mats Larsson, S. Mondal, M. Siano, Osamu Takahashi, Kiyoshi Ueda, and Leszek J. Frasinski

Subjects
Photon, Chemistry, Astrophysics::High Energy Astrophysical Phenomena, Ionization, Atoms in molecules, Molecule, Electron, Atomic physics, Covariance, Absorption (chemistry), Molecular physics, Photon counting
Abstract

Covariance maps of correlated electron emission processes associated with the formation of multiply-ionized core hole states and subsequent decay processes of atoms and molecules upon absorption of x-ray photons from an FEL source are presented.

Published
2013
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11. SACLA: new opportunities for atomic, molecular, and cluster science with XFEL

Author

Kiyoshi Ueda

Subjects
SACLA, Physics, Ionization, Atom, Physics::Atomic and Molecular Clusters, Cluster (physics), Physics::Accelerator Physics, Physics::Atomic Physics, Atomic physics
Abstract

Studying atoms, molecules, and clusters at SACLA, an XFEL in Japan, reveals deep inner-shell ionization and sequential electronic decay cycles repeated multiple times in the heavy atom within the XFEL pulse of < 20 fs.

Published
2013
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12. Competition of Resonant and Nonresonant Paths in Resonance-Enhanced Two-Photon Single Ionization of He by an Ultrashort Extreme-Ultraviolet Pulse

Author

Kiyoshi Ueda and Kenichi L. Ishikawa

Subjects
Physics, Atomic Physics (physics.atom-ph), Scattering, Wave packet, FOS: Physical sciences, General Physics and Astronomy, Physics::Optics, Resonance, Resonance (particle physics), Physics - Atomic Physics, Pulse (physics), symbols.namesake, Excited state, Ionization, Extreme ultraviolet, Femtosecond, Rydberg formula, symbols, Physics::Atomic and Molecular Clusters, High harmonic generation, Physics::Atomic Physics, Perturbation theory, Atomic physics, Pulse-width modulation
Abstract

We theoretically study the pulse-width dependence of the photoelectron angular distribution (PAD) from the resonance-enhanced two-photon single ionization of He by femtosecond ($\lesssim 20$ fs) extreme-ultraviolet pulses, based on the time-dependent perturbation theory and simulations with the full time-dependent Schr\"odinger equation. In particular, we focus on the competition between resonant and nonresonant ionization paths, which leads to the relative phase $\delta$ between the $S$ and $D$ wave packets distinct from the corresponding scattering phase shift difference. When the spectrally broadened pulse is resonant with an excited level, the competition varies with pulse width, and, therefore, $\delta$ and the PAD also change with it. On the other hand, when the Rydberg manifold is excited, $\delta$ and the PAD do not much vary with the pulse width, except for the very short pulse regime., Comment: 5 pages, 5 figures, 1 table

Published
2012
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13. Ultraintense X-Ray Induced Multiple Ionization and Double Core-Hole Production in Molecules

Author

Pavle Juranić, John D. Bozek, Francesco Tarantelli, P. van der Meulen, Kevin C. Prince, Motomichi Tashiro, Masahiro Ehara, Brendan Murphy, Christoph Bostedt, Henning T. Schmidt, M. N. Piancastelli, Li Fang, Edwin Kukk, Timur Osipov, Shin-ichi Wada, Kiyoshi Ueda, P. Salen, Raimund Feifel, Nora Berrah, Mats Larsson, Robert Richter, and Richard D. Thomas

Subjects
Physics, Instrumentation, Atomic and Molecular Physics, and Optics, Astrophysics::High Energy Astrophysical Phenomena, X-ray, Synchrotron radiation, Radiation, Molecular physics, Core (optical fiber), Atomic and Molecular Physics, Ionization, Femtosecond, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, and Optics, Atomic physics, Absorption (electromagnetic radiation), Spectroscopy
Abstract

We used the world first hard x-ray FEL to investigate the response of molecular systems to the ultraintense, femtosecond x-ray radiation. We report sequential multiphoton ionization, frustrated absorption and double core hole production mechanisms.

Published
2011
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