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

L. P. Oloff, M. Oura, K. Rossnagel, Ashish Atma 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

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number123045
JournalNew Journal of Physics
Volume16
DOIs
Publication statusPublished - 2014 Dec 17

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Time-resolved HAXPES at SACLA: Probe and pump pulse-induced space-charge effects'. Together they form a unique fingerprint.

  • Cite this

    Oloff, L. P., Oura, M., Rossnagel, K., Chainani, A. A., Matsunami, M., Eguchi, R., Kiss, T., Nakatani, Y., Yamaguchi, T., Miyawaki, J., Taguchi, M., Yamagami, K., Togashi, T., Katayama, T., Ogawa, K., Yabashi, M., & Ishikawa, T. (2014). Time-resolved HAXPES at SACLA: Probe and pump pulse-induced space-charge effects. New Journal of Physics, 16, [123045]. https://doi.org/10.1088/1367-2630/16/12/123045