Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Surface dynamics II

O 57.1: Vortrag

Mittwoch, 24. März 2010, 15:00–15:15, H40

Time-Resolved XUV pump probe measurements on Surfaces using High Harmonic Radiation — •Thorben Haarlammert¹, Carsten Winter¹, Luca Bignardi², Petra Rudolf², and Helmut Zacharias¹ — ¹Physikalisches Institut, Westfälische Wilhelms Universität, Münster — ²Zernike Institute for Advanced Materials, University of Groningen

We have developed an experimental set-up for time-resolved photoelectron spectroscopy at surfaces using High Order Harmonics of a Ti:Sapphire laser. By employing a LN₂ cooled laser amplifier system operating with repetition rates of up to 10 kHz fast and stable delay scans can be collected. The set-up allows for time-resolved pump and probe measurements with ultra-short pump pulses in the IR, visible or UV spectral range and ultra-short XUV probe pulses at the 25th harmonic order at 39 eV. The duration of the XUV pulses was estimated using the laser assisted photoelectric effect (LAPE). Measurements were performed on single layer Graphene on a Ni (111) crystal surface. First time-resolved results will be presented. In addition, a combination of a toroidal grating and the mirror monochromator allows for conventional angle resolved photoelectron measurements (ARUPS) at different photon energies in the spectral range between 20 eV and 110 eV by applying different Harmonic Orders.