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Itakura, Ryuji; Fushitani, Mizuho*; Hishikawa, Akiyoshi*; Sako, Tokuei*
AIP Conference Proceedings 1702, p.090021_1 - 090021_4, 2015/12
Times Cited Count：0 Percentile：0(Physics, Applied)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 
(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 9-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.
Itakura, Ryuji; Fushitani, Mizuho*; Hishikawa, Akiyoshi*; Sako, Tokuei*
Journal of Physics B; Atomic, Molecular and Optical Physics, 47(19), p.195602_1 - 195602_9, 2014/10
Times Cited Count：3 Percentile：19.04(Optics)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 chirping a laser pulse. We demonstrate that the coherent hole dynamics can be retrieved even in the case of a chirped laser pulse, by labeling the photoion dynamics with the counterpart photoelectron energy.
Kojima, Atsushi; Ishii, Kameo*; Miyata, Yoshiaki*; Kakiuchi, Hideto*; Kaido, Norihiro*; Yoshikawa, Masayuki*; Itakura, Akiyoshi*; Ichimura, Makoto*; Chujo, T.*
Fusion Science and Technology, 51(2T), p.274 - 276, 2007/02
Times Cited Count：2 Percentile：18.73(Nuclear Science & Technology)no abstracts in English
Mase, Atsushi*; Kogi, Yuichiro*; Hojo, Hitoshi*; Yoshikawa, Masayuki*; Itakura, Akiyoshi*; Chujo, T.*; Tokuzawa, Tokihiko*; Kawahata, Kazuo*; Nagayama, Yoshio*; Oyama, Naoyuki; et al.
Fusion Science and Technology, 51(2T), p.52 - 57, 2007/02
Times Cited Count：3 Percentile：25.51(Nuclear Science & Technology)no abstracts in English
Itakura, Ryuji; Fushitani, Mizuho*; Hishikawa, Akiyoshi*; Sako, Tokuei*
no journal, ,
Photoelectron spectra in ultrafast photoionization exhibits a broadened spectra feature leading to the spectral overlap. In this situation, multiple ionic states are superposed. However, we need to take account of the coupling between the photoelectron continuum and the ionic states. In this study, we derive the wavepacket representation of the correlated photoelectron and ion core states and show the numerical results on the ionization of a rage gas atom into the spin-orbit split states.
Itakura, Ryuji; Fushitani, Mizuho*; Hishikawa, Akiyoshi*; Sako, Tokuei*
no journal, ,
In ultrafast photoionization, the spectra width in the photoelectron spectrum is broadended and then the peaks are overlapped, resulting in the coherent superposition of correlated photoelectron and ionic states. In this study, the wave packet picture of correlated photoelectron and ion core is formulated. Numerical simulation is carried out for photoionization of Ar into two spin-orbit split states as a model case. The temporal evolution of ion core dynamics following photoelectron emission will be discussed.
Itakura, Ryuji; Fushitani, Mizuho*; Hishikawa, Akiyoshi*; Sako, Tokuei*
no journal, ,
We theoretically investigate how such an effect appears in ultrafast ionization, by explicitly treating the correlation between a photoelectron and a photoion. One-photon ionization of Ar by a linearly polarized EUV pulse is considered as a model case. The mechanism governing the coherence in the ion will be revealed by examining the temporal variation in the hole density of Ar in a photoelectron-energy resolved manner.
