研究者詳細 - 菱川　明栄

論文 - 菱川　明栄

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Compact XFEL and AMO sciences: SACLA and SCSS 査読有り

Yabashi, M; Tanaka, H; Tanaka, T; Tomizawa, H; Togashi, T; Nagasono, M; Ishikawa, T; Harries, JR; Hikosaka, Y; Hishikawa, A; Nagaya, K; Saito, N; Shigemasa, E; Yamanouchi, K; Ueda, K

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 46 巻 ( 16 ) 頁： 164001 2013年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Physics B: Atomic, Molecular and Optical Physics

The concept, design and performance of Japan's compact free-electron laser (FEL) facilities, the SPring-8 Compact SASE Source test accelerator (SCSS) and SPring-8 Angstrom Compact free electron LAser (SACLA), and their applications in mainly atomic, molecular and optical science are reviewed. At SCSS, intense, ultrafast FEL pulses at extreme ultraviolet (EUV) wavelengths have been utilized for investigating various multi-photon processes in atoms, molecules and clusters by means of ion and electron spectroscopy. The quantum optical effect superfluorescence has been observed with EUV excitation. A pump-probe technique combining FEL pulses with near infrared laser pulses has been realized to study the ultrafast dynamics of atoms, molecules and clusters in the sub-picosecond regime. At SACLA, deep inner-shell multi-photon ionization by intense x-ray FEL pulses has been investigated. The development of seeded FEL sources for producing transversely and temporally coherent light, as well as the expected impact on advanced science are discussed. © 2013 IOP Publishing Ltd.

DOI： 10.1088/0953-4075/46/16/164001

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Scopus

Resonances in three-photon double ionization of Ar in intense extreme ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy 査読有り

Y. Hikosaka, M. Fushitani, A. Matsuda, T. Endo, Y. Toida, E. Shigemasa, M. Nagasono, K. Tono, T. Togashi, M. Yabashi, T. Ishikawa and A. Hishikawa

Phys. Rev. A 88 巻 ( 023421 ) 頁： 023421 2013年8月

Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy 査読有り

Hikosaka, Y; Fushitani, M; Matsuda, A; Endo, T; Toida, Y; Shigemasa, E; Nagasono, M; Tono, K; Togashi, T; Yabashi, M; Ishikawa, T; Hishikawa, A

PHYSICAL REVIEW A 88 巻 ( 2 ) 2013年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review A - Atomic, Molecular, and Optical Physics

Shot-by-shot photoelectron spectroscopy has been performed to study the three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields over a photon energy range of 19.6-22.0 eV. It is found that the double ionization to Ar2+ 3p-2 proceeds sequentially via the formation of singly charged Ar+ 3p-1 states and is enhanced around photon energies of 20.5 and 21.5 eV. Two types of resonance are identified in the two-photon ionization of the Ar+ 3p-1 states: (i) resonances to intermediate states at the one-photon energy level and (ii) those to autoionizing states above the Ar+ ionization threshold. © 2013 American Physical Society.

DOI： 10.1103/PhysRevA.88.023421

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Time-resolved Four-body Coulomb Explosion Imaging of Correlated Dynamics of Hydrogen Atoms in Acetylene Dication 査読有り Open Access

Matsuda, A; Fushitani, M; Takahashi, EJ; Hishikawa, A

XVIIITH INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA 41 巻 2013年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：EPJ Web of Conferences

The correlated motion of the two deuterium atoms associated with the hydrogen migration and structural deformation to non-planar geometry are identified in acetylene dication by the time-resolved four-body Coulomb explosion imaging. © Owned by the authors, published by EDP Sciences, 2013.

DOI： 10.1051/epjconf/20134102013

Open Access

Web of Science

Scopus

Ultrafast Nonlinear Double Excitations of He in Intense EUV FEL Fields 査読有り Open Access

Fushitani, M; Hikosaka, Y; Matsuda, A; Liu, CN; Morishita, T; Shigemasa, E; Hishikawa, A

XVIIITH INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA 41 巻 2013年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：EPJ Web of Conferences

Three-photon double excitation of He in intense EUV FEL fields is studied by the shot-by-shot photoelectron spectroscopy, revealing the enhancement by resonances to the doubly excited states converging to the He+ N=3 level. © Owned by the authors, published by EDP Sciences, 2013.

DOI： 10.1051/epjconf/20134102009

Open Access

Web of Science

Scopus

Shot-by-Shot Photoelectron Spectroscopy of Rare Gas Atoms in Ultrashort Intense EUV Free-Electron Laser Fields

Mizuho Fushitani, Yasumasa Hikosaka, Akitaka Matsuda, Eiji Shigemasa, Akiyoshi Hishikawa

Springer Series in Chemical Physics 頁： 151 - 163 2013年

Two-electron dynamics in nonlinear double excitation of helium by intense ultrashort extreme-ultraviolet pulses 査読有り

Liu, CN; Hishikawa, A; Morishita, T

PHYSICAL REVIEW A 86 巻 ( 5 ) 頁： 13 2012年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review A - Atomic, Molecular, and Optical Physics

We present a theoretical study for multiphoton double excitation of He atoms exposed to an intense ultrashort extreme-ultraviolet (EUV) pulse, where the photon energy coincides with the transition energy from the ground state to a Rydberg state, by solving the time-dependent Schrödinger equation in the hyperspherical coordinates. Photoelectron spectra under the conditions comparable with a recent experiment [Hishikawa, Phys. Rev. Lett.PRLTAO0031- 900710.1103/PhysRevLett.107.243003 107, 243003 (2011)] are calculated and analyzed. We identify the mechanism of the enhanced three-photon absorption probability which is more than one order of magnitude larger than that for the two-photon process in accordance with the experiment. The enhancement is attributed to a propensity rule for double excitation in a two-step mechanism, in which a one-photon absorption by one electron to a Rydberg state is followed by a two-photon absorption by the other electron to an excited orbital, while the first electron remains at nearly the same principle quantum number. Based on the time-dependent perturbation theory, the three-photon absorption probability exhibits peculiar cubic dependence on the pulse duration due to the propensity rule, in contrast to the linear dependence of the two-photon absorption probability. Thus a crossover between the two- and three-photon absorption probabilities takes place for sufficiently intense and long pulses. We also study the time evolution of a doubly excited two-electron wave packet created by an intense ultrashort EUV pulse efficiently using the same enhancement scheme, opening up the possibility of visualizing the correlated motion of two electrons in the time domain. © 2012 American Physical Society.

DOI： 10.1103/PhysRevA.86.053426

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レーザークーロン爆発イメージングによる実時間反応追跡招待有り査読有り

菱川明栄

レーザー研究 40 巻頁： 745-751 2012年10月

EUV and soft X-ray photoelectron spectroscopy of isolated atoms and molecules using single-order laser high-harmonics at 42 eV and 91 eV 査読有り

M. Fushitani, A. Matsuda and A. Hishikawa

J. Electron. Spectrosc. Relat. Phenom. 184 巻頁： 561-568 2012年2月

極紫外自由電子レーザー場における原子のシングルショット光電子分光招待有り査読有り

彦坂泰正，伏谷瑞穂，菱川明栄

しょうとつ 9 巻 ( 1 ) 頁： 5-10 2012年1月

EUV and soft X-ray photoelectron spectroscopy of isolated atoms and molecules using single-order laser high-harmonics at 42 eV and 91 eV 査読有り

Fushitani, M; Matsuda, A; Hishikawa, A

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA 184 巻 ( 11-12 ) 頁： 561 - 568 2012年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Electron Spectroscopy and Related Phenomena

Photoelectron spectroscopy of isolated atoms and molecules using single-order high-harmonics of Ti:Sapphire laser pulses (800 nm, 12 fs/30 fs) is demonstrated. Dielectric multilayer mirrors, SiC/Mg and Mo/Si, are used to isolate the 27th (42 eV) and 59th (91 eV) order harmonics, respectively. The obtained harmonics are characterized by valence and inner-shell photoelectron spectroscopy of Xe. The applications to two-color two-photon ionization of He and pump-probe spectroscopy of ultrafast photodissociation of Br 2, Br 2(C 1Π u) → Br( 2P 3/2) + Br( 2P 3/2), are presented. © 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.elspec.2011.10.002

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Theoretical study of multi-photon double electron excitation of He by intense ultrashort EUV pulses 査読有り

Liu Chien-Nan, Morishita Toru, Watanabe Shinichi, Hishikawa Akiyoshi

XXVII INTERNATIONAL CONFERENCE ON PHOTONIC, ELECTRONIC AND ATOMIC COLLISIONS (ICPEAC 2011), PTS 1-15 388 巻 ( PART 3 ) 2012年

記述言語：日本語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Journal of Physics: Conference Series

We use the time-dependent hypersperhical close-coupling method to study the double excitation of helium atoms by intense ultrashort XUV pulses. In addition to showing the photoelectron yield spectra, we demonstrate that free electron lasers can be used to efficiently create doubly excited electron wave packets, opening up the possibility of visualizing the correlated motion of electrons in atoms. © Published under licence by IOP Publishing Ltd.

DOI： 10.1088/1742-6596/388/3/032007

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Visualizing correlated dynamics of hydrogen atoms in acetylene dication by time-resolved four-body coulomb explosion imaging 査読有り

Matsuda A., Fushitani M., Takahashi E., Hishikawa A.

Springer Proceedings in Physics 125 巻頁： 317 - 322 2012年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Springer Proceedings in Physics

Ultrafast hydrogenmigration in deuterated acetylene dication (C 2D2+2 ) is studied by time-resolved four-body Coulomb explosion imaging, C2D4+2 → D++ C ++ C ++ D +, using a pair of few-cycle intense laser pulses (9 fs, 1.3 × 1014 W/cm 2). Momentum correlation of the D+ ions produced by the full fragmentation process shows that (1) motions of the two deuterium atoms are strongly correlated during the isomerization and (2) the molecular structure deforms to nonplanar geometries. © Springer-Verlag Berlin Heidelberg 2012.

DOI： 10.1007/978-3-642-28948-4_53

Scopus

Enhanced Nonlinear Double Excitation of He in Intense Extreme Ultraviolet Laser Fields 査読有り

Hishikawa, A; Fushitani, M; Hikosaka, Y; Matsuda, A; Liu, CN; Morishita, T; Shigemasa, E; Nagasono, M; Tono, K; Togashi, T; Ohashi, H; Kimura, H; Senba, Y; Yabashi, M; Ishikawa, T

PHYSICAL REVIEW LETTERS 107 巻 ( 24 ) 頁： 243003 2011年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review Letters

Nonlinear, three-photon double excitation of He in intense extreme ultraviolet free-electron laser fields (∼24.1eV, ∼5TW/cm,sup>2) is presented. Resonances to the doubly excited states converging to the He + N=3 level are revealed by the shot-by-shot photoelectron spectroscopy and identified by theoretical calculations based on the time-dependent Schrödinger equation for the two-electron atom under a laser field. It is shown that the three-photon double excitation is enhanced by intermediate Rydberg states below the first ionization threshold, giving a greater contribution to the photoionization yields than the two-photon process by more than 1 order of magnitude. © 2011 American Physical Society.

DOI： 10.1103/PhysRevLett.107.243003

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Scopus

PubMed

クーロン爆発イメージングによる超高速反応追跡招待有り

菱川明栄

光アライアンス 22 巻 ( 11 ) 頁： 19-22 2011年11月

光のゆらぎで探る：自由電子レーザー場中の原子招待有り

伏谷瑞穂, 彦坂泰正, 菱川明栄

光アライアンス 22 巻 ( 10 ) 頁： 25-28 2011年10月

A magnetic-bottle multi-electron-ion coincidence spectrometer 査読有り

Matsuda, A; Fushitani, M; Tseng, CM; Hikosaka, Y; Eland, JHD; Hishikawa, A

REVIEW OF SCIENTIFIC INSTRUMENTS 82 巻 ( 10 ) 頁： 103105 2011年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Review of Scientific Instruments

A novel multi-electron-ion coincidence spectrometer developed on the basis of a 1.5 m-long magnetic-bottle electron spectrometer is presented. Electrons are guided by an inhomogeneous magnetic field to a detector at the end of the flight tube, while a set of optics is used to extract counterpart ions to the same detector, by a pulsed inhomogeneous electric field. This setup allows ion detection with high mass resolution, without impairing the high collection efficiency for electrons. The performance of the coincidence spectrometer was tested with double ionization of carbon disulfide, CS2 → CS 22+e-e-, in ultrashort intense laser fields (2.8 × 1013W/cm2, 280 fs, 1030 nm) to clarify the electron correlation below the rescattering threshold. © 2011 American Institute of Physics.

DOI： 10.1063/1.3648133

Web of Science

Scopus

PubMed

Time-resolved EUV photoelectron spectroscopy of dissociating I<sub>2</sub> by laser harmonics at 80 nm 査読有り Open Access

Fushitani, M; Matsuda, A; Hishikawa, A

OPTICS EXPRESS 19 巻 ( 10 ) 頁： 9600 - 9606 2011年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Optics Express

Generation of single-order laser harmonics in extreme ultraviolet (EUV) and the application to the time-resolved photoelectron spectroscopy of I 2 are demonstrated. The EUV pulses at 80 nm were generated from Kr as the 5th order harmonics of intense 400 nm laser pulses and then separated from other harmonic orders by a thin indium foil. The pump-probe photoelectron spectroscopy of I2 in the B 3Π(0u+) and B" 1Π(1u) states excited by visible laser pulses at 490 nm showed a rapid increase in the yield of atomic iodine (∼400 fs), reflecting the dissociation dynamics evolving simultaneously in the two excited states. © 2011 Optical Society of America.

DOI： 10.1364/OE.19.009600

Time-resolved EUV photoelectron spectroscopy of dissociating I(2) by laser harmonics at 80 nm 査読有り

Fushitani, M. and Matsuda, A. and Hishikawa, A.

Optics Express 19 巻 ( 10 ) 頁： 9600-9606 2011年

記述言語：英語掲載種別：研究論文（学術雑誌）

Generation of single-order laser harmonics in extreme ultraviolet (EUV) and the application to the time-resolved photoelectron spectroscopy of I(2) are demonstrated. The EUV pulses at 80 nm were generated from Kr as the 5th order harmonics of intense 400 nm laser pulses and then separated from other harmonic orders by a thin indium foil. The pump-probe photoelectron spectroscopy of I(2) in the B (3)Pi(0(u)(+)) and B" (1)Pi(1(u)) states excited by visible laser pulses at 490 nm showed a rapid increase in the yield of atomic iodine (similar to 400 fs), reflecting the dissociation dynamics evolving simultaneously in the two excited states. (C) 2011 Optical Society of America

Visualizing hydrogen atoms migrating in acetylene dication by time-resolved three-body and four-body Coulomb explosion imaging 査読有り

Matsuda, A. and Fushitani, M. and Takahashi, E. J. and Hishikawa, A.

Physical Chemistry Chemical Physics 13 巻 ( 19 ) 頁： 8697-8704 2011年

記述言語：英語掲載種別：研究論文（学術雑誌）

The visualization of ultrafast isomerization of deuterated acetylene dication (C(2)D(2)(2+)) is demonstrated by time-resolved Coulomb explosion imaging with sub-10 fs intense laser pulses ( 9 fs, 0.13 PW cm(-2), 800 nm). The Coulomb explosion imaging monitoring the three-body explosion process, C(2)D(2)(3+) -> D(+) + C(+) + CD(+), as a function of the delay between the pump and probe pulses revealed that the migration of a deuterium atom proceeds in a recurrent manner; One of the deuterium atoms first shifts from one carbon site to the other in a short timescale (similar to 90 fs), and then migrates back to the original carbon site by 280 fs, in competition with the molecular dissociation. Correlated motion of the two deuterium atoms associated with the hydrogen migration and structural deformation to non-planar geometry are identified by the time-resolved four-body Coulomb explosion imaging, C(2)D(2)(4+) - D(+) + C(+) + C(+) + D(+).

DOI： Doi 10.1039/C0cp02333g

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