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Electron Dynamics Probed by Time-Resolved Hard X-ray Photoelectron Spectroscopy

Masaki Oura, Lars-Philip Oloff, Ashish Chainani, Kai Rossnagel, Masaharu Matsunami, Ritsuko Eguchi, Takayuki Kiss, Takashi Yamaguchi, Yasuhiro Nakatani, Jun Miyawaki, Kohei Yamagami, Munetaka Taguchi (+10 others)
2014 Transactions of the Materials Research Society of Japan  

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We have realized element-specific pump-probe time-resolved hard X-ray photoelectron spectroscopy (TR-HAXPES) for the study of ultrafast electron dynamics in condensed matter. TR-HAXPES has been applied for the first time to determine the temporal evolution of space-charge effects on Ti 1s core-level photoelectron spectra of SrTiO 3 at the SACLA X-ray free electron laser facility. We found that the temporal evolution of Ti 1s kinetic energy shifts can be well explained by a mean-field model for
more » ... he electron propagation in the vacuum. We also report preliminary results of a real-time laserassisted valence-transition in YbInCu 4 , observed by measuring Yb 3d 5/2 core-level HAXPES spectra at BL19LXU of SPring-8, under ON/OFF conditions of an optical pump-laser. We observed drastic changes in intensities of the Yb 2+ and Yb 3+ spectral components induced by pump-laser irradiation.
doi:10.14723/tmrsj.39.469 fatcat:kp5frv7kfnaipc3mec5s6jlbje
Citation

Masaki Oura, Lars-Philip Oloff, Ashish Chainani, Kai Rossnagel, Masaharu Matsunami, Ritsuko Eguchi, Takayuki Kiss, Takashi Yamaguchi, Yasuhiro Nakatani, Jun Miyawaki, Kohei Yamagami, Munetaka Taguchi, Tadashi Togashi, Tetsuo Katayama, Kanade Ogawa, Makina Yabashi, Tatsuo Gejo, Katsumi Myojin, Kenji Tamasaku, Yoshihito Tanaka, Takao Ebihara, Tetsuya Ishikawa. "Electron Dynamics Probed by Time-Resolved Hard X-ray Photoelectron Spectroscopy." Transactions of the Materials Research Society of Japan 39.4 (2014) 469-473