Faculty Profiles - FUSHITANI, Mizuho

Ultrafast two-photon Rabi oscillations in excited He driven by femtosecond intense laser fields Reviewed

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

XXIX INTERNATIONAL CONFERENCE ON PHOTONIC, ELECTRONIC, AND ATOMIC COLLISIONS (ICPEAC2015), PTS 1-12 Vol. 635 ( 9 ) 2015

Language：Japanese Publishing type：Research paper (international conference proceedings) Publisher：IOP PUBLISHING LTD

We demonstrate ultrafast multiphoton coherent excitation in near-infrared intense laser fields (<= 10 TW/cm(2)) using excited helium in the 1s2p (P-1) 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

Ion-Coincidence Momentum Imaging of Three-Body Coulomb Explosion of Formaldehyde in Ultrashort Intense Laser Fields Reviewed

M. Fushitani, C-M. Tseng, A. Matsuda, A. Hishikawa

INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2015 (ICCMSE 2015) Vol. 1702 2015

Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

Three-body Coulomb explosion of formaldehyde (H2CO) in intense 7- and 35-fs laser fields (1.3 x 10(15) W/cm(2)) 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

Fragment anisotropy on dissociative ionization of NO in two-color intense laser fields Reviewed

Tomoyuki Endo, Ayaka Ishihara, Akitaka Matsuda, Mizuho Fushitani, Akiyoshi Hishikawa

XXIX INTERNATIONAL CONFERENCE ON PHOTONIC, ELECTRONIC, AND ATOMIC COLLISIONS (ICPEAC2015), PTS 1-12 Vol. 635 ( 11 ) 2015

Language：Japanese Publishing type：Research paper (international conference proceedings) Publisher：IOP PUBLISHING LTD

Dissociative-ionization of NO, NO -> NO+ + e(-) -> N+ + O + e(-), in omega-2 omega two-color phase-controlled intense laser fields was investigated by three-dimensional ion momentum imaging. The moment Urn image of the N+ ion exhibited anisotropic distributions peaked at 35 degrees against the laser polarization, which show clear left-right asymmetry depending on the omega-2 omega 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

Determination of Absolute Cross-Sections of Nonresonant EUV-UV Two-Color Two-Photon Ionization of He Reviewed

M. Fushitani, Y. Hikosaka, A. Matsuda, T. Endo, E. Shigemasa, M. Nagasono, T. Sato, T. Togashi, M. Yabashi, T. Ishikawa, A. Hishikawa

ULTRAFAST PHENOMENA XIX Vol. 162 page： 109 - 112 2015

Language：English Publishing type：Research paper (international conference proceedings) Publisher：SPRINGER-VERLAG BERLIN

Single-shot photoelectron spectroscopy was performed for nonresonant EUV-UV two-color two-photon ionization of He. From data analysis on the shot-by-shot basis, the absolute cross-section was determined to be sigma((2))(59.7 nm, 268 nm) = 4.1(6) x 10(-52) cm(4) s.

DOI： 10.1007/978-3-319-13242-6_26

Five-photon sequential double ionization of He in intense extreme-ultraviolet free-electron laser fields Reviewed

Five-photon sequential double ionization of He in intense extreme-ultraviolet free-electron laser fields Reviewed

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 Vol. 90 page： 053403 2014.11

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 - Atomic, Molecular, and Optical Physics Vol. 90 ( 5 ) 2014.11

Photoelectron-photoion correlation in ultrafast multichannel photoionization of Ar Reviewed

Itakura, R., Fushitani, M., Hishikawa, A., Sako, T.

Journal of Physics B: Atomic, Molecular and Optical Physics Vol. 47 ( 19 ) page： 195602 2014.10

Determination of absolute cross-sections of nonresonant EUV-UV two-color two-photon ionization of he

M. Fushitani, Y. Hikosaka, A. Matsuda, T. Endo, E. Shigemasa, M. Nagasono, T. Sato, T. Togashi, M. Yabashi, T. Ishikawa, A. Hishikawa

Optics InfoBase Conference Papers 2014

Ultrafast photoelectron spectroscopy of electron-ion wave packets in Rydberg N2

M. Fushitani, Y. Toida, F. Légaré, A. Hishikawa

Optics InfoBase Conference Papers 2014

Ultrafast coulomb explosion of formaldehyde in 7 and 35 fs intense laser fields studied by triple ion-coincidence momentum imaging

Chien-Ming Tseng, Akitaka Matsuda, Mizuho Fushitani, Akiyoshi Hishikawa

Optics InfoBase Conference Papers 2014

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

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

Dissociative ionization of NO in few-cycle intense laser fields : Effects of pi-sigma electronic transition Reviewed

Tomoyuki Endo, Mizuho Fushitani, Akitaka Matsuda, Akiyoshi Hishikawa

XXVIII INTERNATIONAL CONFERENCE ON PHOTONIC, ELECTRONIC AND ATOMIC COLLISIONS (ICPEAC) Vol. 488 ( SECTION 3 ) 2014

Language：Japanese Publishing type：Research paper (international conference proceedings) Publisher：IOP PUBLISHING LTD

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 pi - sigma electronic transition is clearly reflected in the spatial anisotropy of the fragment ion, N+.

DOI： 10.1088/1742-6596/488/3/032025

Nonresonant EUV-UV two-color two-photon ionization of He studied by single-shot photoelectron spectroscopy Reviewed

Fushitani, M., Hikosaka, Y., Matsuda, A., Endo, T., Shigemasa, E., Nagasono, M., Sato, T., Togashi, T., Yabashi, M., Ishikawa, T., Hishikawa, A.

Physical Review A - Atomic, Molecular, and Optical Physics Vol. 88 ( 6 ) page： 063422 2013.12

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

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 - Atomic, Molecular, and Optical Physics Vol. 88 ( 2 ) page： 023421 2013.8

Time-resolved four-body coulomb explosion imaging of correlated dynamics of hydrogen atoms in acetylene dication Reviewed Open Access

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

EPJ Web of Conferences Vol. 41 2013

Language：English Publishing type：Research paper (international conference proceedings)

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

Ultrafast nonlinear double excitations of he in intense EUV FEL fields Reviewed Open Access

M. Fushitani, Y. Hikosaka, A. Matsuda, C. N. Liu, T. Morishita, E. Shigemasa, A. Hishikawa

EPJ Web of Conferences Vol. 41 2013

Language：English Publishing type：Research paper (international conference proceedings)

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