Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 41: Elektronische Struktur III
O 41.9: Vortrag
Dienstag, 8. März 2005, 12:45–13:00, TU EB107
Energy and angle resolved measurement of the (1π)−1 photoemission cross section of CO adsorbed on Pt(111) — •Grigorios Tsilimis, Sebastian Wegner, Jörg Kutzner, and Helmut Zacharias — Physikalisches Institut, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Straße 10, D-48149 Münster
The c(4×2)-2CO-covered Pt(111) surface is investigated by energy and angle resolved photoelectron spectroscopy (ARUPS) using high-order harmonic radiation. Femtosecond pulses of a table–top, high–repetition rate (1 kHz) Ti:sapphire laser system are focussed into rare gases to generate high-harmonic radiation in the range of hν = 20 to 120 eV (60 − 11 nm). Both the coarse tunability in steps of 3.1 eV as well as a fine tuning within a single harmonic are utilized in the measurements.
The photoemission cross section of the CO-induced structures, in particular the pronounced CO(1π)−1-emission at photon energies around hν=32 eV is analyzed by means of partial wave decomposition. The influence of the surface on the electronic structure of the adsorbed CO leads to a different (1π)−1-emission compared to oriented gas phase CO molecules.