Papers

Peer-reviewed
Dec, 2014

Time-resolved HAXPES at SACLA: probe and pump pulse-induced space-charge effects

NEW JOURNAL OF PHYSICS
  • L-P Oloff
  • M. Oura
  • K. Rossnagel
  • A. Chainani
  • M. Matsunami
  • R. Eguchi
  • T. Kiss
  • Y. Nakatani
  • T. Yamaguchi
  • J. Miyawaki
  • M. Taguchi
  • K. Yamagami
  • T. Togashi
  • T. Katayama
  • K. Ogawa
  • M. Yabashi
  • T. Ishikawa
  • Display all

Volume
16
Number
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1088/1367-2630/16/12/123045
Publisher
IOP PUBLISHING LTD

Time-resolved hard x-ray photoelectron spectroscopy (trHAXPES) is established using the x-ray free-electron laser SACLA. The technique extends time-resolved photoemission into the hard x-ray regime and, as a core-level spectroscopy, combines element and atomic-site specificity and sensitivity to the chemical environment with femtosecond time resolution and bulk (sub-surface) sensitivity. The viability of trHAXPES using 8 keV x-ray free-electron-laser radiation is demonstrated by a systematic investigation of probe and pump pulse-induced vacuum space-charge effects on the V 1s emission of VO2 and the Ti 1s emission of SrTiO3. The time and excitation energy dependencies of the measured spectral shifts and broadenings are compared to the results of N-body numerical simulations and simple analytic (mean-field) models. Good agreement between the experimental and calculated results is obtained. In particular, the characteristic temporal evolution of the pump pulse-induced spectral shift is shown to provide an effective means to determine the temporal overlap of pump and probe pulses. trHAXPES opens a new avenue in the study of ultrafast atomic-site specific electron and chemical dynamics in materials and at buried interfaces.

Link information
DOI
https://doi.org/10.1088/1367-2630/16/12/123045
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000346822200003&DestApp=WOS_CPL
ID information
  • DOI : 10.1088/1367-2630/16/12/123045
  • ISSN : 1367-2630
  • Web of Science ID : WOS:000346822200003

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