Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)
O 44.37: Poster
Mittwoch, 28. März 2007, 17:00–19:30, Poster C
Ag islands on C60 functionalized Au(111) compared to deposited Ag clusters — •Torsten Richter1, Stefanie Duffe1, Thomas Irawan1, Benedikt Sieben1, 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 are interested in the electronic structure of clusters in contact with a surface. In addition to experiments with mass selected Ag clusters we grew Ag islands by evaporation of Ag atoms on a C60 functionalized Au(111) surface at a temperature below 50 K. The investigation of the silver islands with a low temperature scanning tunnelling microscope shows quite broad height distributions. Tempering the cluster/surface system up to different temperatures leads to a higher mobility of the silver islands and more and more coalescence. We observed a strong coalescence at temperatures above 150 K. These experiments can be compared with experiments of mass selected geometrically magic clusters deposited on C60/Au(111) at room temperature. Here we observed very narrow height distributions. We also studied the position of the clusters relative to the C60 molecules. We found out that the size selected clusters are on top of a C60 molecule and the grown islands at a position between two C60 molecules.