Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.55: Poster
Wednesday, March 29, 2006, 14:30–17:30, P2
ARUPS with higher harmonics using a 2D hemispherical energy analyser — •Stefan Mathias1, Ralf Frese2, Martin Wiesenmayer1, Sven Passlack1, Dorothea Hoffmann1, Martin Aeschlimann1, and Michael Bauer1 — 1Department of Physics, TU Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany — 2Physics Department , University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
Time-resolved UPS is an attractive experimental tool to study the ultra-fast dynamics of processes at surfaces [1]. Next to the photoelectron energy distribution also the time and angular dependence of the photoemission spectrum can contain important information, for instance the dynamics related to the coupling between molecules adsorbed on a surface. Short pulse EUV-light sources, such as higher harmonic generation (HHG), are typically driven at rather low repetition rates. Therefore, highly efficient parallel detection schemes are necessary to achieve time and angle resolved photoemission data (TR-ARUPS). Here we present first ARUPS experiments performed with a 1 kHz HHG light source using a hemispherical energy analyser, equipped with a 2D-detector for parallel energy and momentum detection. The HHG light source provides photon energies up to 45 eV and the photoelectrons are collected between +/- 7∘ (k∣∣ = +/- 0,42 1/Å at 45 eV) with an angle resolution of better than 0,2∘. We discuss limitations, advantages and disadvantages of this detection scheme in comparison to a time of flight electron analyser, typically used for this kind of experiments. [1] M. Bauer, J. Phys. D: Appl. Phys. 38 (2005) R1-R15