Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 50: Particles and Clusters II
O 50.2: Vortrag
Donnerstag, 29. März 2007, 11:30–11:45, H38
Properties of mass selected Ag clusters in comparison to Ag island growth studied by low-temperature STM and STS — •Stefanie Duffe1, Thomas Irawan1, Markus Bieletzki1, Torsten Richter1, 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 deposit mass selected Ag clusters on a C60 functionalized Au(111) surface at room temperature with a cluster machine consisting of a magnetron sputter gas aggregation source, a differential pumping stage with a cryo pump and a high transmission infinite range mass selector. We especially focus on clusters with closed geometric shells. At room temperature the C60 molecules rotate on the surface [1], which may explain the observed mobility of the deposited clusters on the C60 surface. For the deposition of Ag clusters with 55, 147 and 309 atoms at room temperature we observed extremely narrow height distributions with a cluster height of 1.7 nm and similar STS spectra for each cluster size. For Ag clusters with 561 and 923 atoms also larger heights were observed. To study the temperature dependent mobility we grew Ag islands on C60/Au(111) by the deposition af Ag atoms at low temperatures.
[1] E.I. Altman, R.J. Colton, Surf. Sci. 295, 13 (1993)