Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 85: Electron and spin dynamics I
O 85.10: Vortrag
Donnerstag, 17. März 2011, 18:45–19:00, WIL A317
How to do time-resolved photoelectron spectroscopy at a free-electron laser — •Christian Sohrt1, Stefan Hellmann1, Martin Beye2, Timm Rohwer1, Martin Marcynski-Bühlow1, Matthias Kalläne1, Florian Sorgenfrei3, Michael Bauer1, Alexander Föhlisch2, Wilfried Wurth3, Lutz Kipp1, and Kai Rossnagel1 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24118 Kiel, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany. — 3Institut für Experimentalphysik and Center for Free-Electron Laser Science, Universität Hamburg, 22761 Hamburg, Germany
The Free-Electron Laser in Hamburg (FLASH) generates highly brilliant, ultrashort, and coherent pulses in the soft X-ray regime enabling many fascinating experiments that are not possible at other sources. After various challenges concerning space-charge effects as well as timing, synchronization and data aquisition issues have recently been solved, optical pump-XUV probe photoelectron spectroscopy on solid surfaces is now possible. The wide probing photon energy range of up to 1000 eV should allow time-resolved core-level spectroscopy with time and energy resolutions of ∼200 fs and ∼100 meV, respectively. We performed a proof-of-principle experiment on the correlated layer compound 1T-TaS2 [1] demonstrating that FLASH can indeed be used to investigate core-level dynamics at solid surfaces on the femtosecond time scale. This work is funded in part by the BMBF (FSP 301 FLASH).
[1] Hellmann et al., PRL 105 187401 (2010)