Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Methods: Theory and Experiment
O 65.10: Vortrag
Donnerstag, 28. Februar 2008, 14:15–14:30, MA 141
Space–Charge Effects in Photoelectron Spectroscopy at FLASH — •Martin Marczynski-Bühlow, Matthias Kalläne, Stefan Hellmann, Sabrina Lang, Claas Thede, Tim Riedel, Sönke Harm, Kai Rossnagel, and Lutz Kipp — Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098
With its brilliant, ultrashort, and coherent photon pulses ranging from the VUV to the soft X–ray regime FLASH (Free–Electron Laser in Hamburg) offers the possibility to study a variety of ”new physics” with novel as well as with traditional synchrotron radiation techniques. We have determined general limits for photoelectron spectroscopy experiments with these highly intense photon pulses with regard to radiation damage, space–charge effects, and FLASH machine parameters. Here we present angle–resolved as well as core–level photoelectron spectra of the transition–metal dichalcogenide 1T–TaS2 in the Mott insulating phase (T = 140 K). The photoelectron spectra were investigated particularly with respect to the occurrence of space–charge effects as a function of pulse intensity and compared with self-consistent N-body simulations based on the Barnes & Hut Treecode Algorithm. The measurements were carried out at the monochromator beamline PG2 of FLASH using the 3rd FEL harmonic (hν = 115.5 eV).
This work is supported by the Innovationsfond des Landes Schleswig-Holstein.