Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 22: Ultrafast Surface Dynamics
O 22.2: Vortrag
Dienstag, 17. März 2015, 11:00–11:15, MA 042
Time-resolved hard-x-ray photoelectron spectroscopy at the x-ray free-electron laser SACLA — •Lars-Philip Oloff1,2, Masaki Oura2, Ashish Chainani2, and Kai Rossnagel1,2 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24118 Kiel, Germany — 2RIKEN, SPring-8 Center, Sayo-cho, Hyogo, 679-5148, Japan
Time-resolved hard x-ray photoelectron spectroscopy (trHAXPES) is established as a novel ultrafast spectroscopy technique using the x-ray free-electron laser SACLA (Japan) [1,2]. The technique extends time-resolved photoemission into the hard x-ray regime and, as a core-level spectroscopy, combines atomic-site and chemical-state specificity with femtosecond time-resolution and bulk sensitivity. It can thus open novel opportunities for probing ultrafast electron dynamics in strongly excited materials, at buried interfaces, and in electronic devices under in operando conditions.
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. The measured time and excitation energy dependencies of spectral shifts and broadenings are compared to the results of N-body numerical simulations and simple analytic (mean-field) models.
[1] M. Oura et al., J. Synchrotron Rad. 21, 183 (2014)
[2] L.-P. Oloff et al., New J. Phys., in press (2014)