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Abstract
Time-resolved X-ray photoelectron spectroscopy at FLASH
S. Hellmann, C. Sohrt, M. Beye, T. Rohwer, F. Sorgenfrei, M. Marczynski-Bühlow, M. Kalläne, H. Redlin, F. Hennies, M. Bauer, A. Föhlisch, L. KippW. Wurth, K. Rossnagel
New Journal of Physics, New J. Phys. 14 (2012) 013062
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 compound 1T–TaS2 in response to impulsive optical excitation is measured on the sub-picosecond to nanosecond timescale. The observed multicomponent dynamics is related to the intrinsic melting and reformation of the chargedensity wave as well as to extrinsic pump-laser induced vacuum space-charge effects.
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