記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Science  

Since the discovery of roaming as an alternative molecular dissociation pathway in formaldehyde (H2CO), it has been indirectly observed in numerous molecules. The phenomenon describes a frustrated dissociation with fragments roaming at relatively large interatomic distances rather than following conventional transition-state dissociation; incipient radicals from the parent molecule self-react to form molecular products. Roaming has been identified spectroscopically through static product channel- resolved measurements, but not in real-time observations of the roaming fragment itself. Using timeresolved Coulomb explosion imaging (CEI), we directly imaged individual "roamers"on ultrafast time scales in the prototypical formaldehyde dissociation reaction. Using high-level first-principles simulations of all critical experimental steps, distinctive roaming signatures were identified. These were rendered observable by extracting rare stochastic events out of an overwhelming background using the highly sensitive CEI method.

DOI： 10.1126/science.abc2960

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PubMed

記述言語：日本語   出版者・発行元：Physical Review Letters  

Ultrafast multiphoton ionization of Xe in strong extreme ultraviolet free-electron laser (FEL) fields (91 eV, 30 fs, 1.6×1012 W/cm2) has been investigated by multielectron-ion coincidence spectroscopy. The electron spectra recorded in coincidence with Xe4+ show characteristic features associated with two-photon absorption to the 4d-2 double core-hole (DCH) states and subsequent Auger decay. It is found that the pathway via the DCH states, which has eluded clear identification in previous studies, makes a large contribution to the multiple ionization, despite the long FEL pulse duration compared with the lifetime of the 4d core-hole states.

DOI： 10.1103/PhysRevLett.124.193201

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Nature Photonics  

Coherent light-matter interaction provides powerful methods for manipulating quantum systems. Rabi oscillation is one such process. As it enables complete population transfer to a target state, it is thus routinely exploited in a variety of applications in photonics, notably quantum information processing. The extension of coherent control techniques to the multiphoton regime offers wider applicability, and access to highly excited or dipole-forbidden transition states. However, the multiphoton Rabi process is often disrupted by other competing nonlinear effects such as the a.c. Stark shift, especially at the high laser-field intensities necessary to achieve ultrafast Rabi oscillations. Here we demonstrate a new route to drive two-photon Rabi oscillations on timescales as short as tens of femtoseconds, by utilizing the strong-field phenomenon known as Freeman resonance. The scenario is not specific to atomic helium as investigated in the present study, but broadly applicable to other systems, thus opening new prospects for the ultrafast manipulation of Rydberg states.

DOI： 10.1038/NPHOTON.2015.228

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記述言語：日本語   出版者・発行元：Optics InfoBase Conference Papers  

Single-shot photoelectron spectroscopy was performed for nonresonant EUV-UV twocolor two-photon ionization of He. From data analysis on the shot-by-shot basis, the absolute cross-section was determined to be σ(2)(597nm, 268nm) = 4.1(6)×10-52 cm4 s. © 2014 OSA.

DOI： 10.1364/up.2014.08.tue.p2.5

Scopus

記述言語：日本語   出版者・発行元：Optics InfoBase Conference Papers  

Ultrafast three-body Coulomb explosion of formaldehyde (H2CO) in intense laser fields has been studied. The pulse duration dependence of the Newton plot of the fragment ions revealed the ultrafast molecular dynamics in the dication states. © 2014 OSA.

DOI： 10.1364/up.2014.09.wed.p3.23

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記述言語：日本語   出版者・発行元：Optics InfoBase Conference Papers  

Intensity dependence of polarized He (21P) atoms in intense NIR laser fields are investigated by single-shot photoelectron spectroscopy, revealing two-photon Rabi oscillations between the initial 1s2p and 1snf (n = 5,6) Rydberg states. © 2014 OSA.

DOI： 10.1364/up.2014.08.tue.p2.4

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記述言語：日本語   出版者・発行元：Optics InfoBase Conference Papers  

Time-resolved photoelectron spectroscopy of N2 Rydberg using single-order high harmonics at 80 nm reveals ultrafast wavepacket dynamics (~3 fs) of both Rydberg electron and the corresponding N2 + core as the beating oscillation (~ 300 fs). © 2014 OSA.

DOI： 10.1364/up.2014.07.mon.p1.5

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記述言語：日本語   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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掲載種別：研究論文（学術雑誌）  

This review outlines advances that have been made in recent years (2005-2007) in the study of ultrafast dynamics occurring in physical, chemical and biological research fields by using pump-probe techniques. Special emphasis is placed on coherent phenomena in materials and experimental achievements of coherent control of wave packets dynamics. After a brief theoretical description of pump-probe methods, an overview of nuclear and electronic coherences appearing in pump-probe spectroscopy is presented. Some of the highlights include molecular alignments, wave packet interferometry, hydrogen migration, and attosecond electron dynamics. © 2008 The Royal Society of Chemistry.

DOI： 10.1039/b703983m

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記述言語：日本語  

DOI： 10.1039/b609058n

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.2147241

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担当区分：筆頭著者,　責任著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/b509153e

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.1480003

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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  

Three-dimensional momentum distributions of tunnel-electrons produced from Ar and H2 in circularly polarized intense laser fields (1035 nm, 35 fs, 2×1014 W/cm2) have been measured by electron–ion coincidence momentum imaging. The photoelectrons recorded with a gas mixture of Ar and H2 exhibit torus-like distributions in the momentum space. Although ionization potentials are similar (15.8 eV for Ar and 15.4 eV for H2), significant differences are identified in the radius and the width of the photoelectron torus recorded in coincidence with the counterpart ions (Ar+ and H2+). The differences are confirmed by theoretical calculations based on the strong-field approximation, showing that the orbital character of ionizing electrons is encoded in the momentum distribution of tunnel electrons.

DOI： 10.1016/j.elspec.2022.147280

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担当区分：筆頭著者,　責任著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Physical Review A  

Ultrafast dynamics of highly excited Rydberg states of is investigated by time-resolved shot-by-shot photoelectron spectroscopy with EUV-free-electron-laser pump (40.8 eV) and near-infrared probe (1.56 eV) pulses. Sorting the single-shot spectra in the order of relative delay between the two pulses allows for investigating ultrafast decays of intermediate states participating in the double ionization of Xe. Observed photoelectron spectra show a biexponential decay within ∼100 fs and ∼300 ps in addition to constant signals lasting longer than 1 ns. These ultrafast decays reflect the lifetimes of autoionizing Rydberg states converging to electronically excited states of . The results demonstrate that time-resolved shot-by-shot EUV-free-electron-laser photoelectron spectroscopywith a synchronized optical laser provides a powerful tool for investigating ultrafast electron emission processes.

DOI： 10.1103/physreva.104.023102

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevA.104.023102/fulltext

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：AIP Conference Proceedings  

Using time-resolved Coulomb explosion imaging (CEI) in an ultraviolet (UV) pump near infrared (NIR) probe experiment, we directly image the different dissociation dynamics in the formaldehyde molecule. Different pathways are distinguished from each other, despite their statistical nature. To extract such dynamics, hidden in a statistical background, calls for an elimination of noise. In our approach, we take advantage of CEI being a quasi-background-free technique.

DOI： 10.1063/5.0047930

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出版者・発行元：Optics InfoBase Conference Papers  

DOI： 10.1364/UP.2020.Th4A.1

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Bulletin of the Chemical Society of Japan  

Molecules irradiated with intense laser pulses (field intensity ∼1015W/cm2) exhibit a variety of characteristic processes, such as tunneling ionization, electron rescattering, high-order harmonics generation and Coulomb explosion, that cannot be seen in a weak light field. These features have attracted attention in the last decades as they provide unique approaches to visualize and manipulate ultrafast dynamics of atoms and molecules. Here we discuss molecular processes in intense laser fields, with focuses on the applications to ultrafast imaging and control of reaction dynamics.

DOI： 10.1246/bcsj.20200158

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Synchrotron Radiation  

The pulse duration of soft X-ray free-electron laser (FEL) pulses of SACLA BL1 (0.2-0.3 nC per bunch, 0.5-0.8 MeV) were characterized by photoelectron sideband measurements. The intensity of the He 1 s photoelectron sidebands generated by a near-infrared femtosecond laser was measured as a function of the time delay between the two pulses using an arrival time monitor. From the width of the cross-correlation trace thus derived, the FEL pulse duration was evaluated to be 28 ± 5 fs full width at half-maximum in the photon energy range between 40 eV and 120 eV.

DOI： 10.1107/S1600577520008516

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Physical Review A  

Dissociative tunneling ionization of nitric oxide (NO) in linearly polarized phase-locked two-color femtosecond intense laser fields (45 fs, λ=800 and 400 nm, total field intensity I=1×1014W/cm2) has been studied by three-dimensional ion momentum imaging. The N+ fragment produced by the dissociative ionization, NO→NO++e-→N++O+e-, exhibits a butterflylike momentum distribution peaked at finite angles with respect to the laser polarization direction. In addition, a clear dependence on the relative phase between the two laser fields is observed, showing that the tunneling ionization occurs efficiently when the electric field points from N to O. For the highest kinetic energy component, the observed orientation dependence is well explained with theoretical calculations by the weak-field asymptotic theory for the 2πhighest occupied molecular orbital (HOMO). On the other hand, the peak angle shifts toward the laser polarization direction as the kinetic energy decreases, indicating that pathways other than direct ionization from the HOMO contribute to the dissociative ionization.

DOI： 10.1103/PhysRevA.100.053422

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Optics Letters  

The ultrafast dynamics of molecular nitrogen (N2) just below the ionization threshold has been investigated by time-resolved photoelectron spectroscopy using a single harmonic centered at hν = 15.38 eV. The evolution of the Rydberg wavepacket launched by the ultrashort EUV pulse is probed by a time-delayed femtosecond NIR laser pulse. The observed photoelectron spectra show two series of vibrational peaks to the ground X2Σg+ state and the first excited A2Πu state of N+2 . Among these, two photoelectron peaks with the vibrational quantum numbers vX+ = 4 and vA+ = 1 exhibit clear anti-phase oscillations with a period of 300 fs, showing that two Rydberg states converging to the X2Σg+ and A2Πu ionic states interact with each other, thus causing periodic switching in the population of the ion core states.

DOI： 10.1364/OE.27.019702

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記述言語：日本語   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  

Ion-coincidence momentum imaging of Coulomb explosion of formaldehyde (H2CO) in femtosecond intense laser fields (800 nm, 1.3 × 1015 W/cm2) is performed with two different laser pulse durations (7 fs and 35 fs). In the 7-fs laser fields, the full fragmentation pathway from H2CO4+ → H+ + H+ + C+ + O+ is identified. The angles between the fragment momenta are well reproduced by a simple Coulomb explosion model from the geometry of neutral formaldehyde, showing that the molecular structure is virtually frozen along the bending coordinates during the multiple ionization. Three-body Coulomb explosion pathways from triply charged states, H2CO3+ → H+ + H+ + CO+ and H+ + CH+ + O+, are observed in both the 7-fs and 35-fs laser fields. Significant changes in the momentum angle distribution and asymmetric energy partitioning between two H+ ions are observed in the 35-fs case, which are attributed to structural deformation prior to the Coulomb explosion in the longer pulse.

DOI： 10.1016/j.elspec.2018.07.001

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担当区分：筆頭著者   記述言語：日本語  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Physical Chemistry Chemical Physics  

Selective bond breaking of CO2 in phase-locked ω-2ω two-color intense laser fields (λ = 800 nm and 400 nm, total field intensity I ∼ 1014 W cm-2) has been investigated by coincidence momentum imaging. The CO+ and O+ fragment ions produced by two-body Coulomb explosion, CO22+ → CO+ + O+, exhibit asymmetric distributions along the laser polarization direction, showing that one of the two equivalent C-O bonds is selectively broken by the laser fields. At a field intensity higher than 2 × 1014 W cm-2, the largest fragment asymmetry is observed when the relative phase between the ω and 2ω laser fields is ∼0 and π. On the other hand, an increase of the asymmetry and a shift of the phase providing the largest asymmetry are observed at lower field intensities. The selective bond breaking and its dependence on the laser field intensity are discussed in terms of a mechanism involving deformation of the potential energy surfaces and electron recollision in intense laser fields.

DOI： 10.1039/c6cp07471e

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担当区分：筆頭著者,　責任著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Structural Dynamics  

We present applications of extreme ultraviolet (XUV) single-order laser harmonics to gas-phase ultrafast photoelectron spectroscopy. Ultrashort XUV pulses at 80 nm are obtained as the 5th order harmonics of the fundamental laser at 400 nm by using Xe or Kr as the nonlinear medium and separated from other harmonic orders by using an indium foil. The single-order laser harmonics is applied for real-time probing of vibrational wavepacket dynamics of I2 molecules in the bound and dissociating low-lying electronic states and electronic-vibrational wavepacket dynamics of highly excited Rydberg N2 molecules.

DOI： 10.1063/1.4964775

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

Tunneling-ionization imaging of photoexcitation of NO has been demonstrated by using few-cycle near-infrared intense laser pulses (8 fs, 800 nm, 1.1×1014 W/cm2). The ion image of N+ fragment ions produced by dissociative ionization of NO in the ground state, NO (X2Π,2π)→NO++e-→N++O+e-, exhibits a characteristic momentum distribution peaked at 45° with respect to the laser polarization direction. On the other hand, a broad distribution centered at ∼0° appears when the A2Σ+ (3sσ) excited state is prepared as the initial state by deep-UV photoexcitation. The observed angular distributions are in good agreement with the corresponding theoretical tunneling ionization yields, showing that the fragment anisotropy reflects changes of the highest-occupied molecular orbital by photoexcitation.

DOI： 10.1103/PhysRevLett.116.163002

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記述言語：日本語   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  

We theoretically investigate the laser-assisted photoionization of He by an extreme ultra violet (XUV) pulse in the presence of a linearly chirped intense laser pulse by solving the time-dependent Schrödinger equation within the single-active-electron approximation. Analysis based on the time-dependent perturbation theory is also carried out to provide more physical insights. A new scheme is shown to be capable of extracting the arrival time of an XUV free-electron laser (FEL) pulse relative to an external laser pulse as well as the XUV pulse duration from the photoelectron sidebands resulting from XUV ionization in the presence of a chirped laser pulse. This scheme is independent of the energy fluctuation and the timing jittering of the FEL pulse. Therefore it can be implemented in a non-invasive way to characterize FEL pulses on a shot-by-shot basis in time-resolved spectroscopy.

DOI： 10.1088/0953-4075/49/3/034005

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記述言語：日本語   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  

Coulomb explosion of CO2, CO2 → CO22+ + 2e- → CO+ + O+ + 2e-, in phase-locked two-color ultrashort intense laser fields (800 nm and 400 nm, ∼1014 W/cm2) has been investigated by coincidence momentum imaging. The momentum images of the O+ and CO+ fragments show asymmetric distributions along the laser polarization direction depending on the relative phase of the two-color laser fields. The fragment asymmetry becomes most prominent (∼4%) at the relative phases providing the largest asymmetry of the electric field amplitude, with the O+ fragments preferentially ejected to the stronger field side. The mechanism of the asymmetric bond breaking of the two equivalent C-O bonds is discussed in terms of the nuclear dynamics in CO22+.

DOI： 10.1016/j.elspec.2015.12.010

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

DOI： 10.11316/jpsgaiyo.71.1.0_819

CiNii Books

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：AIP Conference Proceedings  

We theoretically investigate coherent dynamics of ions created through ultrafast multichannel photoionization from a viewpoint of photoelectron-photoion correlation. The model calculation on single-photon ionization of Ar reveals that the coherent hole dynamics in Ar+ associated with a superposition of the spin-orbit states 2PJ (J = 3/2 and 1/2) can be identified by monitoring only the photoion created by a Fourier-transform limited extreme ultraviolet (EUV) pulse with the fs pulse duration, while the coherence is lost by a chirped EUV pulse. It is demonstrated that by coincidence detection of the photoelectron and photoion the coherent hole dynamics can be extracted even in the case of ionization by a chirped EUV pulse with the sufficiently wide bandwidth.

DOI： 10.1063/1.4938829

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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：AIP Conference Proceedings  

Three-body Coulomb explosion of formaldehyde (H2CO) in intense 7- and 35-fs laser fields (1.3 × 1015 W/cm2) has been investigated by using ion-coincidence momentum imaging technique. Two types of explosion pathways from the triply charged state, H2CO3+ → (i) H+ + H+ + CO+ and (ii) H+ + CH+ + O+, have been identified. It is shown from the momentum correlation of the fragment ions of pathway (i), that the geometrical structure of the molecule is essentially frozen along the H-C-H bending coordinate for the 7-fs case. On the other hand, for a longer pulse duration (35 fs), structural deformation along the C-H stretching and H-C-H bending coordinates is identified, which is ascribed to the nuclear dynamics in the dication states populated within the laser pulse duration.

DOI： 10.1063/1.4938821

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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  

Dissociative ionization of NO, NO → NO+ + e- → N+ + O + e-, in ω-2ω two-color phase-controlled intense laser fields was investigated by three-dimensional ion momentum imaging. The momentum image of the N+ ion exhibited anisotropic distributions peaked at 35° against the laser polarization, which show clear left-right asymmetry depending on the ω-2ω relative phase. The present study demonstrates that the molecular orbital can be retrieved by distinguishing the difference between the N and O side from the fragment anisotropy by intense laser pulses.

DOI： 10.1088/1742-6596/635/11/112027

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その他リンク： http://orcid.org/0000-0003-1444-8917

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：Springer Proceedings in Physics  

Single-shot photoelectron spectroscopy was performed for nonresonant EUV-UV two-color two-photon ionization of He. From data analysis on the shotby- shot basis, the absolute cross-section was determined to be σ(2) (59.7 nm, 268 nm) = 4.1(6) × 10-52 cm4 s.

DOI： 10.1007/978-3-319-13242-6_26

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その他リンク： http://orcid.org/0000-0003-1444-8917

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 demonstrate ultrafast multiphoton coherent excitation in near-infrared intense laser fields (≤10 TW/cm2) using excited helium in the 1s2p (1P) state as the target. Strong two-photon coupling between the 2p state and the 5f and 6f Rydberg states drives ultrafast Rabi oscillations in tens of femtosecond. Theoretical calculations solving the time-dependent Schrodinger equation were carried out to elucidate the strong field effects.

DOI： 10.1088/1742-6596/635/9/092082

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その他リンク： http://orcid.org/0000-0003-1444-8917

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1103/PhysRevA.90.053403]

記述言語：日本語   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  

A multiphoton ionization process of He in intense extreme ultraviolet free-electron laser fields is investigated in a photon energy range of hv=20.1-20.8eV using shot-by-shot photoelectron spectroscopy. A photoelectron peak resulting from sequential double ionization of He due to five-photon absorption is observed around hv=20.4. Shot-by-shot analysis of photoelectron spectra shows that two-photon resonance to the He+(2s2S) state from the He+ ground state is responsible for the substantial enhancement of five-photon double ionization. Effective cross sections for two-photon absorption between the 1s and 2s states of He+ and for one-photon absorption from the He+ 2s state are obtained.

DOI： 10.1103/PhysRevA.90.053403

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記述言語：日本語   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  

Ultrafast multichannel single-photon ionization of Ar is investigated theoretically by a model calculation incorporating correlation between the photoelectron and photoion. It is shown that the coherent hole dynamics in Ar+associated with a superposition of the spin-orbit states can be observed by using a Fourier-transform limited laser pulse for ionization, while the coherence is degraded or lost by chirped a laser pulse. We demonstrate that the coherent hole dynamics can be retrieved even in the case of ionization by a chirped laser pulse, by labeling the photoion dynamics with the counterpart photoelectron energy.

DOI： 10.1088/0953-4075/47/19/195602

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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  

Dissociative ionization (DI) of NO in few-cycle intense laser fields was investigated by using the 3D momentum imaging method. It was found that the symmetry change in the outermost occupied molecular orbital upon the π-σ electronic transition is clearly reflected in the spatial anisotropy of the fragmention, N+.

DOI： 10.1088/1742-6596/488/3/032025

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その他リンク： http://orcid.org/0000-0003-1444-8917

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その他リンク： http://orcid.org/0000-0003-1444-8917

記述言語：日本語   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  

Single-shot photoelectron spectroscopy of nonresonant two-color two-photon ionization of He has been carried out using an intense free-electron laser (FEL) at 59.7 nm and a femtosecond UV laser at 268 nm. By shot-by-shot analysis of photoelectron spectra, the cross section for nonresonant two-color ionization of He is determined to be σ(2)=4.1(6)×10-52 cm4 s. The cross-correlation trace derived from the nonresonant signals shows that the temporal resolution of the system is 0.36(3) ps, which is mainly governed by the timing jitter between the FEL and UV laser pulses. © 2013 American Physical Society.

DOI： 10.1103/PhysRevA.88.063422

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記述言語：日本語   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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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：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

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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：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

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記述言語：英語   出版者・発行元：AMER CHEMICAL SOC  

DOI： 10.1021/jp301367j

Web of Science

掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/jp301367j

Scopus

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

記述言語：日本語   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

記述言語：日本語   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

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Scopus

記述言語：日本語   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

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Scopus

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Physical Chemistry Chemical Physics  

The visualization of ultrafast isomerization of deuterated acetylene dication (C2D22+) 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, C2D23+ → 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 (∼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 2D24+ → D+ + C+ + C+ + D+. © 2011 the Owner Societies.

DOI： 10.1039/c0cp02333g

Web of Science

Scopus

掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jms.2011.04.014

Web of Science

Scopus

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

Photoelectron spectroscopy has been performed to study the multiphoton double ionization of Ar in an intense extreme ultraviolet laser field (hν∼21eV, ∼5TW/cm2), by using a free electron laser (FEL). Three distinct peaks identified in the observed photoelectron spectra clearly show that the double ionization proceeds sequentially via the formation of Ar +: Ar+hν→Ar++e- and Ar ++2hν→Ar2++e-. Shot-by-shot recording of the photoelectron spectra allows simultaneous monitoring of FEL spectrum and the multiphoton process for each FEL pulse, revealing that the two-photon ionization from Ar+ is significantly enhanced by intermediate resonances in Ar+. © 2010 The American Physical Society.

DOI： 10.1103/PhysRevLett.105.133001

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Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/jp900287m

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/jp806466x

Web of Science

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.elspec.2008.12.004

Web of Science

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：Institute of Physics Publishing  

We discuss two novel approaches to visualize ultrafast dynamics of polyatomic molecules using few-cycle intense laser pulses and the high-order harmonics in the soft X-ray region, respectively. First, we present the real-time Coulomb explosion imaging of ultrafast isomerization of C 2D2 2+ by using intense few-cycle laser pulses (&lt
10 fs, ∼1 PW/cm2, ∼800 nm) to show that the hydrogen migration proceeds recurrently in competition with the molecular dissociation. Secondly, we present a new experimental setup for the real-time inner-core excitation imaging, focusing on the generation and separation of the light source using the 59th order harmonic pulses (∼91 eV) and their characteristics. © 2009 IOP Publishing Ltd.

DOI： 10.1088/1742-6596/185/1/012009

Scopus

掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.cplett.2008.04.123

Web of Science

Scopus

掲載種別：研究論文（学術雑誌）  

DOI： 10.1088/0953-4075/41/7/074013

Web of Science

Scopus

掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.2889002

Web of Science

Scopus

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.2828557

Web of Science

掲載種別：研究論文（学術雑誌）  

DOI： 10.1103/PhysRevLett.99.258302

Web of Science

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/jp0761113

Web of Science

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-VERLAG BERLIN  

We report on coherent zone-boundary phonons of solid Ar doped with Cl-2 in pump-probe spectra. Comparison with molecular dynamic simulation shows that specific motions of Ar atoms in the (100) plane are responsible for the observed oscillations.

Web of Science

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：IOP PUBLISHING LTD  

Ultrafast hydrogen migration in deuterated acetylene dication (C(2)D(2)(2+)) is studied by the pump-probe Coulomb explosion imaging with few-cycle intense laser pulses (9 fs, 0.13 PW/cm(2), 800 nm). The temporal evolution of the momenta of the fragment ions produced by the three-body explosion, C(2)D(2)(3+) -> D(+) + C(+) + CD(+), shows that the migration proceeds in a recurrent manner: The deuterium atom first shifts from one carbon site to the other in a short time scale (similar to 90 fs), and then migrates back to the original carbon site by 280 fs, in competition with the molecular dissociation.

DOI： 10.1088/1742-6596/88/1/012056

Web of Science

Web of Science

Web of Science

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IOP PUBLISHING LTD  

The ortho-to-para nuclear spin ratio of cyclopropenylidene ( cyclic C3H2) in TMC-1 cores was investigated using the 45 m radio telescope at Nobeyama Radio Observatory. We have observed four ortho lines (J(KaKc) = 2(12) - 1(01), 3(12) - 3(03), 3(21) - 3(12), and 3(30) - 3(21)) and four para lines (J(KaKc) 2(02) - 1(11), 2(11) - 2(02), 2(20) - 2(11), and 3(22) - 3(13)) of cyclic C3H2 in six cores in TMC-1. A statistical equilibrium analysis of the observed intensities revealed apparent correlation between the ortho-to-para ratio of cyclic C3H2 and chemical evolution of the molecular cloud; the ortho-to-para ratio in younger cores is less than 2, while that in older cores is close to the statistical ratio of 3. A simple chemical model calculation indicates that the correlation is ascribed to the conservation of nuclear spin angular momenta in chemical reactions relevant to the production, destruction, and reproduction of cyclic C3H2. Since cyclic C3H2 has been observed in a variety of sources, the ortho-to-para ratio of cyclic C3H2 may be a useful probe of chemical evolution of molecular clouds.

DOI： 10.1086/501041

Web of Science

記述言語：英語  

DOI： 10.1080/01442350500444107

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1093/pasj/57.2.325

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Scopus

その他リンク： http://orcid.org/0000-0002-0567-6881

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-VERLAG BERLIN  

The diatomic Cl-2 in solid Ar is examined to discuss the information obtained by wavepacket interferometry in condensed phase and to contrast it with femtosecond pump-probe and linear absorption spectra.

Web of Science

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.1642582

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.vibspec.2003.06.001

Web of Science

掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.1556560

Web of Science

Scopus

掲載種別：研究論文（学術雑誌）  

We report the preliminary results of our experiments with stimulated Raman scattering in para-hydrogen crystal aimed at developing a continuously tunable laboratory laser source of mid-infrared radiation. With laser pulses at 532 nm, a conversion efficieney for the first Stokes beam of as much as 20% in the forward direction was observed through a single-pass, 5-cm-long crystal. Generation of mid-infrared pulses at 4.5 μm was achieved by use of the output of a near-infrared pulsed laser (1.6 μm, 3 ns), and an absorption spectrum of gaseous CD4 molecules was successfully recorded. These results suggest use of the solid para-hydrogen Raman shifter as a promising light source for mid-infrared spectroscopy. © 2003 Optical Society of America.

DOI： 10.1364/OL.28.000037

Scopus

Web of Science

掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.1614182

Web of Science

Scopus

掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.1619353

Web of Science

Scopus

Web of Science

掲載種別：研究論文（学術雑誌）  

Alkyl iodides were photolyzed in solid parahydrogen at about 5 K. The first photolysis with 253.7 nm photons yielded two products by reactions, RI + hv (253.7 nm) → Rfree + ·Ifree and (R·-·I), the latter being a complex between the radical R· and the iodine atom ·I. Subsequent photolysis with 193 nm photons activated the radical moiety in both products to induce a reaction, R· + H2 + hv (193 nm) → RH + ·H, which gave the products RHfree and (RH-·I). The radical R· and the alkane RH were characterized by the mid-IR absorption while the iodine atoms in ·Ifree and (R·-·I) and (RH-·I) were identified by the near IR absorption of the magnetic dipole transition of the atom. © 2002 Published by Elsevier Science B.V.

DOI： 10.1016/S0009-2614(02)00354-8

Scopus

Web of Science

掲載種別：研究論文（学術雑誌）  

The photochemistry of (HI)m⋯(CO2)n (m, n = 1,2, ...) complexes trapped in solid parahydrogen was studied by Fourier transform infrared absorption spectroscopy. Photolysis of the HI in the HI⋯(CO2)n complexes results in the generation of carbon monoxide and water molecules along with iodine atoms. Analysis of the observed spectra leads to the conclusion that the energetic hydrogen atom produced by the photolysis of HI initiates the reaction with one of the CCh molecules in the complexes as H + CO2 → OH + CO, which is followed by the secondary reaction of OH radicals with the matrix hydrogen as OH + H2 → H2O + H. These four-atom reactions are of practical importance in combustion processes as well as of theoretical importance in fundamental chemical dynamics. The result of the present study shows the usefulness of the parahydrogen matrix for fundamental study of photochemistry with the use of weakly bound complexes. © 2000 American Chemical Society.

Scopus

Web of Science

掲載種別：研究論文（学術雑誌）  

Photolysis of methyl iodide in solid parahydrogen (p-H2) at about 5 K is studied with ultraviolet light at 253.7 and 184.9 nm. It is found that the light at 253.7 nm produces only methyl radical, whereas the light at 184.9 nm yields both methyl radical and methane. The mechanism of the formation of the photoproducts is elucidated by analyzing the temporal behavior of the observed vibrational absorption. It is concluded that methyl radical in the ground state does not react with p-H2 molecules appreciably but that the radical in the electronic excited state of B̃(2A1′), accessible by reabsorption of 184.9 nm photons by the radical, decomposes to a singlet methylene CH2 ã(1A1) and a hydrogen atom (2S) and that the singlet methylene reacts with a p-H2 molecule to give methane. © 1998 American Institute of Physics.

DOI： 10.1063/1.477276

Scopus

担当区分：筆頭著者   記述言語：日本語   出版者・発行元：レーザ加工学会  

CiNii Books

担当区分：筆頭著者   記述言語：日本語   出版者・発行元：日本分光学会  

CiNii Books

担当区分：筆頭著者  

担当区分：筆頭著者  

記述言語：日本語   出版者・発行元：公益財団法人 高輝度光科学研究センター  

X線強レーザー場における原子分子の非線形光学応答の理解を目的として、XFELにおける電子−イオンコインシデンス分光法の開拓を行った。磁気ボトル型分光器を用いたコインシデンス計測系を導入し、Ar/Ne混合ガスを標的として評価を行った。与えられた実験条件下で、XFELによって生成したAr L殻およびNe K殻空孔の崩壊に伴うオージェ電子と、対応するイオン種 (Ar^p+,Ne^q+) の全コインシデンス事象における真のコインシデンス事象は98%程度と見積られ、本分光法の有用性が示された。

DOI： 10.18957/rr.5.2.291

記述言語：日本語   出版者・発行元：公益財団法人 高輝度光科学研究センター  

Ne原子のX線ポンプ－近赤外プローブ電子分光を行った。XFEL（<i>hν</i> = 4.70 keV）によるNe 2p^-2オージェ電子ピーク（~ 800 eV）の高エネルギー側に近赤外レーザー場強度に応じて明瞭なサイドバンドが観測された。サイドバンド強度のパルス遅延時間の関数として得られた相互相関トレースは、タイミングジッターに由来する約2 psの幅をもつことが見出された。

DOI： 10.18957/rr.4.2.344

記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

DOI： 10.11316/jpsgaiyo.70.2.0_516

CiNii Books

記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

CiNii Books

記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

CiNii Books

記述言語：日本語  

J-GLOBAL

記述言語：日本語  

J-GLOBAL

記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

CiNii Books

記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

CiNii Books

記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

CiNii Books

記述言語：日本語  

J-GLOBAL

記述言語：日本語  

J-GLOBAL

記述言語：日本語   出版者・発行元：一般社団法人 日本物理学会  

CiNii Books

J-GLOBAL

記述言語：日本語   出版者・発行元：日本工業出版  

CiNii Books

記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

CiNii Books

記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

CiNii Books

記述言語：日本語  

J-GLOBAL

記述言語：日本語   出版者・発行元：日本放射光学会  

CiNii Books

記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

CiNii Books

記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

CiNii Books

記述言語：日本語   出版者・発行元：高温学会レーザ加工学会  

CiNii Books

記述言語：英語   掲載種別：書評論文，書評，文献紹介等   出版者・発行元：ROYAL SOC CHEMISTRY  

We perform time resolved pump-probe spectroscopy on small halogen molecules ClF, Cl-2, Br-2, and I-2 embedded in rare gas solids (RGS). We find that dissociation, angular depolarization, and the decoherence of the molecule is strongly influenced by the cage structure. The well ordered crystalline environment facilitates the modelling of the experimental angular distribution of the molecular axis after the collision with the rare gas cage. The observation of many subsequent vibrational wave packet oscillations allows the construction of anharmonic potentials and indicate a long vibrational coherence time. We control the vibrational wave packet revivals, thereby gaining information about the vibrational decoherence. The coherence times are remarkable larger when compared to the liquid or high pressure gas phase. This fact is attributed to the highly symmetric molecular environment of the RGS. The decoherence and energy relaxation data agree well with a perturbative model for moderate vibrational excitation and follow a classical model in the strong excitation limit. Furthermore, a wave packet interferometry scheme is applied to deduce electronic coherence times. The positions of those cage atoms, excited by the molecular electronic transitions are modulated by long living coherent phonons of the RGS, which we can probe via the molecular charge transfer states.

DOI： 10.1039/b609058n

Web of Science

開催年月日： 2021年3月

会議種別：口頭発表（招待・特別）  

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開催年月日： 2019年9月

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会議種別：公開講演，セミナー，チュートリアル，講習，講義等  

開催年月日： 2023年1月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：ウインクあいち   国名：日本国  

開催年月日： 2023年1月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：立命館大学びわこ・くさつキャンパス   国名：日本国  

開催年月日： 2023年1月

記述言語：日本語   会議種別：ポスター発表  

開催地：立命館大学びわこ・くさつキャンパス   国名：日本国  

開催年月日： 2022年9月

記述言語：日本語   会議種別：ポスター発表  

開催年月日： 2022年8月

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開催年月日： 2022年7月

記述言語：英語   会議種別：ポスター発表  

開催地：Online session, Montreal, Canada   国名：カナダ  

開催年月日： 2022年6月

記述言語：英語   会議種別：ポスター発表  

開催地：Online   国名：日本国  

開催年月日： 2022年3月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン開催  

開催年月日： 2021年9月 - 2021年10月

記述言語：英語   会議種別：口頭発表（招待・特別）  

開催年月日： 2021年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン開催  

開催年月日： 2021年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン開催  

開催年月日： 2021年7月

会議種別：口頭発表（招待・特別）  

開催年月日： 2021年6月

記述言語：英語   会議種別：ポスター発表  

開催地：Online   国名：日本国  

開催年月日： 2021年3月

会議種別：口頭発表（招待・特別）  

開催年月日： 2020年1月 - 2020年2月

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開催年月日： 2018年10月

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開催年月日： 2018年8月 - 2018年9月

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開催年月日： 2014年1月 - 2014年2月

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開催年月日： 2013年7月

会議種別：口頭発表（招待・特別）  

開催年月日： 2013年3月

会議種別：口頭発表（招待・特別）  

開催年月日： 2013年1月

会議種別：口頭発表（招待・特別）  

開催年月日： 2012年9月

会議種別：口頭発表（招待・特別）  

開催年月日： 2012年2月

会議種別：口頭発表（招待・特別）  

開催年月日： 2011年5月

会議種別：口頭発表（招待・特別）  

開催年月日： 2010年11月 - 2010年12月

会議種別：口頭発表（招待・特別）  

開催年月日： 2010年5月

会議種別：口頭発表（招待・特別）  

開催年月日： 2008年12月

会議種別：口頭発表（招待・特別）  

記述言語：日本語