Faculty Profiles - FUSHITANI, Mizuho

Papers - FUSHITANI, Mizuho

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Wave-packet manipulation of He Rydberg states by a seeded free-electron laser Reviewed Open Access

Mathieu Dumergue, Paolo Antonio Carpeggiani, Tamás Csizmadia, Miltcho Danailov, Alexander Demidovich, Giovanni De Ninno, Michele Di Fraia, Per Eng-Johnsson, Dominik Ertel, Hikaru Fujise, Mizuho Fushitani, Luca Giannessi, Harshitha Nandiga Gopalakrishna, Akiyoshi Hishikawa, Heide Ibrahim, Sergei Kühn, Francois Légaré, Yu Luo, Praveen Kumar Maroju, Johan Mauritsson, Matteo Moioli, Anna Olofsson, Jasper Peschel, Oksana Plekan, Stephen T. Pratt, Lorenzo Raimondi, Primož Rebernik Ribič, Shu Saito, Giuseppe Sansone, Ronak Shah, Emma R. Simpson, Daehyun You, Marco Zangrando, Carlo Callegari, Kiyoshi Ueda, Kevin C. Prince

Physical Review Research Vol. 6 ( 4 ) page： 043323 2024.12

Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society (APS)

We report a two-dimensional pump-control-probe spectroscopic study of the dynamics of singly excited He Rydberg-state wave packets with a seeded extreme ultraviolet (XUV) free-electron laser (FEL) source. A pair of coherent XUV pulses, defined by their coarse time separation and relative phase, created and manipulated the wave packets. The He atoms were postionized by infrared (IR) pulses, and the ion yield was measured as a function of XUV phase and IR arrival time. We tagged and sorted the relative phase of the XUV pulse pair on a single-shot basis by fitting each FEL spectrum with a suitable function that accounts for nonidealities of the XUV pulse pairs, associated with the seeding process; more generally, the fit returns the time-dependent electric field of the FEL spectra. The experimental two-dimensional maps of ion yields, measured as a function of IR (probe) delay and of XUV (pump-control) phase, were compared with the solution of the first-order time-dependent Schrödinger equation for this field. Despite the fact that the experimental conditions imply strong excitation, beyond the approximations of first-order perturbation theory, the simulated map satisfactorily reproduces the experimental one for temporally well-separated pulses. We show that by selecting data at appropriate values of pump-control phase, we enhance or suppress the amplitude of chosen wave-packet components consisting of two or more Rydberg states. When the temporal overlap of the pulse pair cannot be neglected, the phase reconstruction is underdetermined, and we provide a simplified comparison between data and simulations.

Published by the American Physical Society 2024

DOI： 10.1103/physrevresearch.6.043323

Open Access

Scopus

Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.6.043323/fulltext

State-selective dissociative double ionization of CH3I and CH2I2 via I 4d core-hole states studied by multi-electron–ion coincidence spectroscopy Reviewed Open Access

Mizuho Fushitani, Yasumasa Hikosaka, Motomichi Tashiro, Akiyoshi Hishikawa

The Journal of Chemical Physics Vol. 160 ( 17 ) page： 174307 2024.5

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：AIP Publishing

The dissociative double ionization of CH3I and CH2I2 irradiated with extreme ultraviolet light at hv = 100 eV is investigated by multi-electron–ion coincidence spectroscopy using a magnetic bottle type electron spectrometer. The spin–orbit state-resolved Auger electron spectra for the I 4d core-hole states, (I 4d3/2)−1 and (I 4d5/2)−1, provide clear identifications of electronic states of CH3I2+ and CH2I22+. The dominant ion species produced after the double ionization correlate with the Auger electron energy, showing that different fragmentation pathways are open depending on the electronic states populated by the Auger decay. Theoretical calculations are performed to understand the fragmentation from the doubly charged states and the observed spin–orbit specificity in the Auger decay.

DOI： 10.1063/5.0204769

Open Access

Scopus

Wave packet dynamics and control in excited states of molecular nitrogen Reviewed International coauthorship International journal Open Access

Mizuho Fushitani, Hikaru Fujise, Akiyoshi Hishikawa, Daehyun You, Shu Saito, Yu Luo, Kiyoshi Ueda, Heide Ibrahim, Francois Légaré, Stephen T. Pratt, Per Eng-Johnsson, Johan Mauritsson, Anna Olofsson, Jasper Peschel, Emma R. Simpson, Paolo Antonio Carpeggiani, Dominik Ertel, Praveen Kumar Maroju, Matteo Moioli, Giuseppe Sansone, Ronak Shah, Tamás Csizmadia, Mathieu Dumergue, Harshitha Nandiga Gopalakrishna, Sergei Kühn, Carlo Callegari, Miltcho Danailov, Alexander Demidovich, Lorenzo Raimondi, Marco Zangrando, Giovanni De Ninno, Michele Di Fraia, Luca Giannessi, Oksana Plekan, Primoz Rebernik Ribic, Kevin C. Prince

The Journal of Chemical Physics Vol. 160 ( 10 ) page： 104203 2024.3

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：AIP Publishing

Wave packet interferometry with vacuum ultraviolet light has been used to probe a complex region of the electronic spectrum of molecular nitrogen, N2. Wave packets of Rydberg and valence states were excited by using double pulses of vacuum ultraviolet (VUV), free-electron-laser (FEL) light. These wave packets were composed of contributions from multiple electronic states with a moderate principal quantum number (n ∼ 4–9) and a range of vibrational and rotational quantum numbers. The phase relationship of the two FEL pulses varied in time, but as demonstrated previously, a shot-by-shot analysis allows the spectra to be sorted according to the phase between the two pulses. The wave packets were probed by angle-resolved photoionization using an infrared pulse with a variable delay after the pair of excitation pulses. The photoelectron branching fractions and angular distributions display oscillations that depend on both the time delays and the relative phases of the VUV pulses. The combination of frequency, time delay, and phase selection provides significant control over the ionization process and ultimately improves the ability to analyze and assign complex molecular spectra.

DOI： 10.1063/5.0188182

Open Access

Scopus

Imaging Ultrafast Dissociation Dynamics: OCS & Roaming in Formaldehyde Open Access

Endo T., Neville S.P., Ziems K.M., Lassonde P., Qu C., Schmidt B.E., Fujise H., Fushitani M., Hishikawa A., Gräfe S., Houston P.L., Bowman J.M., Schuurman M.S., Légaré F., Ibrahim H.

Springer Proceedings in Physics Vol. 300 page： 75 - 82 2024

Publisher：Springer Proceedings in Physics

Upon photoexcitation, molecules break apart, following different dissociation reactions. We can image these dissociation pathways using Coulomb explosion imaging (CEI) and sometimes we can control them using asymmetric laser fields. In the formaldehyde molecule, we can see fragments following the direct, conventional dissociation path, as well as fragments deviating from this minimum energy path. So-called roaming fragments or “roamers” explore the potential energy landscape in a statistical manner and could be directly captured in real-time, despite the signal’s statistical character. This is possible due to the single-molecule sensitivity of CEI and we could show that the onset of roaming occurs actually several orders of magnitude earlier than previously expected. In the polar molecule OCS we go one step further by controlling the fragmentation process using two-color asymmetric laser fields. In addition to expected direct ionization effects, we also see post-ionization contributions, which are usually not visible in heavy polar molecules. We thus show in two different examples that CEI provides the means to extract new, unexpected pathways, which would otherwise remain hidden underneath a strong background.

DOI： 10.1007/978-3-031-47938-0_8

Open Access

Scopus

Capturing transient core-to-core resonances in Kr in intense extreme-ultraviolet laser fields by electron-ion coincidence spectroscopy Reviewed Open Access

Mizuho Fushitani, Makoto Yamada, Hikaru Fujise, Shigeki Owada, Tadashi Togashi, Kyo Nakajima, Makina Yabashi, Akitaka Matsuda, Yasumasa Hikosaka, Akiyoshi Hishikawa

Physical Review A (Letter) Vol. 107 ( 2 ) page： L021101 2023.2

Imaging and Controlling ultrafast Dissociation Dynamics; from conventional to surprising paths

Endo T., Neville S.P., Lassonde P., Qu C., Schmidt B.E., Fushitani M., Hishikawa A., Houston P.L., Bowman J.M., Schuurman M.S., Légaré F., Ibrahim H.

Proceedings of SPIE the International Society for Optical Engineering Vol. 12419 2023

Publisher：Proceedings of SPIE the International Society for Optical Engineering

Upon photo-excitation of a molecule it will break apart. We can see fragments following direct, conventional dissociation paths, as well as fragments deviating from this minimum energy path. The latter are called roaming fragments and explore the potential energy landscape in a statistical manner. Dissociating and roaming fragments are directly captured using Coulomb explosion imaging (CEI) and individual pathways are distinguished based on state-of-the-art theory analysis.

DOI： 10.1117/12.2649247

Scopus

Following ultrafast Roaming Dissociation Dynamics with Coulomb Explosion Imaging

Endo T., Neville S., Lassonde P., Qu C., Fujise H., Fushitani M., Hishikawa A., Houston P., Bowman J., Légaré F., Schuurman M., Ibrahim H.

2023 Conference on Lasers and Electro Optics CLEO 2023 2023

Following ultrafast Roaming Dissociation Dynamics with Coulomb Explosion Imaging

Endo T., Neville S., Lassonde P., Qu C., Fujise H., Fushitani M., Hishikawa A., Houston P., Bowman J., Légaré F., Schuurman M., Ibrahim H.

CLEO Fundamental Science CLEO Fs 2023 2023

Electron-ion Coincidence Imaging of O2 in Intense Laser Fields with Additional Dissociation Pulses

Ikeya D., Matsuda A., Fushitani M., Hishikawa A.

Optics Infobase Conference Papers 2022

Roaming in Formaldehyde – and how to get there

Endo T., Neville S.P., Lassonde P., Qu C., Fujise H., Fushitani M., Hishikawa A., Houston P.L., Bowman J.M., Légaré F., Schuurman M.S., Ibrahim H.

Optics Infobase Conference Papers 2022

Time-resolved shot-by-shot photoelectron spectroscopy of autoionizing Xe+ states by EUV–free-electron-laser and near-IR laser pulses Reviewed

Mizuho Fushitani, Yoshitaka Kawabe, Hikaru Fujise, Makoto Yamada, Hiroka Hasegawa, Shigeki Owada, Tadashi Togashi, Kyo Nakajima, Makina Yabashi, Akitaka Matsuda, Yasumasa Hikosaka, Akiyoshi Hishikawa

Physical Review A Vol. 104 ( 2 ) page： 023102 2021.8

Capturing roaming molecular fragments in real time Reviewed International journal

Tomoyuki Endo, Simon P. Neville, Vincent Wanie, Samuel Beaulieu, Chen Qu, Jude Deschamps, Philippe Lassonde, Bruno E. Schmidt, Hikaru Fujise, Mizuho Fushitani, Akiyoshi Hishikawa, Paul L. Houston, Joel M. Bowman, Michael S. Schuurman, François Légaré, Heide Ibrahim

Science Vol. 370 ( 6520 ) page： 1072 - + 2020.11

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：American Association for the Advancement of Science (AAAS)

Since the discovery of roaming as an alternative molecular dissociation pathway in formaldehyde (H<sub>2</sub>CO), 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 time-resolved 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

Web of Science

Scopus

PubMed

Multielectron-Ion Coincidence Spectroscopy of Xe in Extreme Ultraviolet Laser Fields: Nonlinear Multiple Ionization via Double Core-Hole States

Fushitani M., Sasaki Y., Matsuda A., Fujise H., Kawabe Y., Hashigaya K., Owada S., Togashi T., Nakajima K., Yabashi M., Hikosaka Y., Hishikawa A.

PHYSICAL REVIEW LETTERS Vol. 124 ( 19 ) 2020.5

Language：Japanese Publisher：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

Web of Science

Scopus

Multielectron-Ion Coincidence Spectroscopy of Xe in Extreme Ultraviolet Laser Fields: Nonlinear Multiple Ionization via Double Core-Hole States Reviewed

M. Fushitani, Y. Sasaki, A. Matsuda, H. Fujise, Y. Kawabe, K. Hashigaya, S. Owada, T. Togashi, K. Nakajima, M. Yabashi, Y. Hikosaka, and A. Hishikawa

Phys. Rev. Lett. Vol. 124 ( 19 ) page： 193201 2020.5

Femtosecond two-photon Rabi oscillations in excited He driven by ultrashort intense laser fields Reviewed

Fushitani, M., Liu, C.-N., Matsuda, A., Endo, T., Toida, Y., Nagasono, M., Togashi, T., Yabashi, M., Ishikawa, T., Hikosaka, Y., Morishita, T., Hishikawa, A.

Nature Photonics Vol. 10 ( 2 ) page： 102 - + 2016.2

Two-photon rabi oscillations of excited he atoms in ultrafast strong laser field ionization

Fushitani M., Liu C.N., Matsuda A., Endo T., Toida Y., Hikosaka Y., Nagasono M., Togashi T., Yabashi M., Ishikawa T., Morishita T., Hishikawa A.

Optics Infobase Conference Papers 2014

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

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

Journal of Electron Spectroscopy and Related Phenomena Vol. 184 ( 11-12 ) page： 561 - 568 2012.1

Applications of pump-probe spectroscopy Reviewed

Mizuho Fushitani

Annual Reports on the Progress of Chemistry - Section C Vol. 104 page： 272 - 297 2008

Publishing type：Research paper (scientific journal)

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

Scopus

Coherence and control of molecular dynamics in rare gas matrices

Bargheer, M; Borowski, A; Cohen, A; Fushitani, M; Gerber, RB; Gühr, M; Hamm, P; Ibrahim, H; Kiljunen, T; Korolkov, MV; Kühn, O; Manz, J; Schmidt, B; Schröder, M; Schwentner, N

ANALYSIS AND CONTROL OF ULTRAFAST PHOTOINDUCED REACTIONS Vol. 87 page： 257 - 385 2007

Cage motions induced by electronic and vibrational excitations: Cl-2 in Ar Reviewed

M Fushitani, N Schwentner, M Schroder, O Kuhn

JOURNAL OF CHEMICAL PHYSICS Vol. 124 ( 2 ) 2006.1

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS

Femtosecond dynamics of molecular vibrations as well as cage motions in the B <- X transition of Cl-2 in solid Ar have been investigated. We observed molecular vibrational wave-packet motion in experimental pump-probe spectra and an additional oscillation with a 500 fs period which is assigned to the zone-boundary phonon of the Ar crystal. The cage motion is impulsively driven by the B <- X transition due to the expansion of the electronic cloud of the chromophore. To clarify the underlying mechanism, we performed simulations based on the diatomics-in-molecules method which takes into account the different shapes of the Cl-2 electronic wave function in the B and X states as well as the anisotropic interaction with the matrix. The simulation results show that Ar atom motion in the (100) plane is initiated by the electronic transition and that only those Ar atoms oscillate coherently with an similar to 500 fs period which are essentially decoupled from the molecular vibration. Their phase and time evolution are in good agreement with the experimentally observed oscillation, supporting the assignment as a displacive excitation of coherent phonons. (c) 2006 American Institute of Physics.

DOI： 10.1063/1.2147241

Web of Science

PubMed

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Papers - FUSHITANI, Mizuho