Open AccessTime-resolved x-ray photoelectron spectroscopy at FLASH
Author(s) -
S. Hellmann,
C. Sohrt,
Martin Beye,
Timm Rohwer,
F. Sorgenfrei,
M. Marczynski-Bühlow,
M. Kalläne,
H. Redlin,
Franz Hennies,
Michael Bauer,
Alexander Föhlisch,
L. Kipp,
W. Würth,
Kai Roßnagel
Publication year - 2012
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/14/1/013062
Subject(s) - physics , nanosecond , picosecond , laser , atomic physics , excitation , x ray photoelectron spectroscopy , spectroscopy , flash (photography) , free electron laser , space charge , electron , optics , nuclear magnetic resonance , quantum mechanics
The technique of time-resolved pump–probe x-ray photoelectron spectroscopy using the free-electron laser in Hamburg (FLASH) is described in detail. Particular foci lie on the macrobunch resolving detection scheme, the role of vacuum space-charge effects and the synchronization of pump and probe lasers. In an exemplary case study, the complete Ta 4f core-level dynamics in the layered charge-density-wave (CDW) compound 1T-TaS2 in response to impulsive optical excitation is measured on the sub-picosecond to nanosecond timescale. The observed multi-component dynamics is related to the intrinsic melting and reformation of the CDW as well as to extrinsic pump-laser-induced vacuum space-charge effects