Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 33: Teilchen und Cluster II
O 33.3: Vortrag
Montag, 7. März 2005, 11:15–11:30, TU EB107
Photoelectron spectroscopy of "free clusters on surfaces" — •T. Irawan1, D. Boecker1, F. Ghaleh1, I. Barke1, H. Hövel1, C. Yin2, and B. von Issendorff2 — 1Experimentelle Physik I, Universität Dortmund, D-44221 Dortmund — 2Fakultät für Physik, Universität Freiburg, D-79104 Freiburg
The interaction with a surface can change the electronic structure of clusters significantly compared to the corresponding free clusters. We plan to study this with the direct comparison of photoelectron spectroscopy for mass selected clusters deposited on surfaces and the same clusters studied in a free cluster beam. Here we present experiments which were performed as a preparatory work for these deposition experiments. Metal clusters (gold and lead) were produced by island growth on rare gas layers on different surfaces (HOPG, Au(111) and Pb(111)) by deposition of metal atoms [1]. The electronic coupling to the surface and charging effects in the photoemission process were studied with UPS. We observed significant energetic shifts if the islands were decoupled from the surface by the rare gas layer and different materials for the substrate and the clusters were used. This can be interpreted as the limit of "free clusters on surfaces".
[1] V.N. Antonov, J.S. Palmer, A.S. Bhatti, J.H. Weaver, Phys. Rev. B 68, 205418 (2003).