Dresden 2006 – wissenschaftliches Programm
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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 29.23: Poster
Mittwoch, 29. März 2006, 14:30–17:30, P2
Scanning Tunnelling Microscopy and Photoemission of Clusters at Surfaces — •Markus Bieletzki1, Thomas Irawan1, Stefanie Krause1, Heinz Hövel1, Chunrong Yin2, and Bernd von Issendorff2 — 1Universität Dortmund, Experimentelle Physik I, 44221 Dortmund, Germany — 2Universität Freiburg, Fakultät für Physik, 79104 Freiburg, Germany
We study the electronic structure of cluster/surface systems and the nature of charge transfer processes between the cluster and the surface. STM/STS and UPS on size selected large clusters in contact with a surface will be combined with photoelectron spectroscopy on the same clusters in the gas phase. The direct comparison of the three different techniques is expected to improve the understanding of the cluster-surface interaction. For metal islands (gold and lead) on different surfaces (HOPG, Au(111) and Pb(111)) 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 a thick rare gas layer and different materials for the substrate and the islands were used [1]. C60 is a promising model system for STS on clusters at surfaces.
[1] T. Irawan, D. Boecker, F. Ghaleh, C. Yin, B. v. Issendorff and H. Hövel, No-dqMetal Clusters on Rare Gas Layers - Growth and SpectroscopyNo-dq, Appl. Phys. A (published online Sept. 2005)