Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.62: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Mass selected copper clusters on graphite (HOPG): Photoelectron spectroscopy with ultraviolet light — •Christoph Schröder1, David Engemann1, Niklas Grönhagen1, Natalie Miroslawski1, Bernd von Issendroff2, and Heinz Hövel1 — 1Technische Universität Dortmund, Experimentale Physik I, Germany — 2Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Germany
We investigated mass selected copper clusters between 34 and 92 atoms deposited at 125 K on graphite (HOPG) using ultraviolet photoelectron spectroscopy (UPS). The clusters were softlanded with less then 0.1 eV per atom kinetic energy. Cluster were deposited with different coverage for each cluster size and measured at 125 K. For a better interpretation we subtracted normalized HOPG spectra from the measured cluster spectra to extract the d-band structure of the clusters. Afterwards we annealed the sample for 1 hour at RT and observed changes in the UPS spectra depending on the cluster coverage. For these investigations the source of exciting radiation was a He-gas discharge lamp (hν=21,2 eV). In order to get more information about the clusters we will use Ar (hν=11,6 eV) instead of He in our discharge lamp for future experiments. For this reason we have installed a heatable LiF-window.