Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Electronic Structure of Surfaces
O 66.17: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
Ultrafast time and angle resolved photoemission spectroscopy measurements using high harmonic radiation above 70eV photon energy and sub-1eV resolution at 10kHz repetition rate — •Jürgen Schmidt1, Alexander Guggenmos1,2, Soo Hoon Chew1, and Ulf Kleineberg1,2 — 1LMU München, Fakultät für Physik, Am Coulombwall 1, 85748 Garching — 2MPQ, Hans-Kopfermann-Str. 1, 85748 Garching
High harmonic generation has established as the standard tool for ultrafast time resolved photoelectron spectroscopy experiments to study electron dynamics on gases and solids. Angle resolved measurements additionally give insight into the momentum space of the electrons and provide full information about the band structure dynamics. These measurements benefit from sources with high repetition rate on the one hand and high photon energies on the other hand in order to be able to also address core-like electron states which revealed insight into the temporal dynamics of the photoemission process [1]. Here we show that our source produces harmonic radiation between 70 and 100eV at a repetition rate of 10kHz with sufficient flux for angle resolved photoemission experiments [2] and we report about time resolved measurements on various metal surfaces excited by few-cycle NIR pulses. [1] Cavalieri et al., Nature 449, 1029 (2007) [2] Schmidt et al., Rev. Sci. Instrum., to be submitted