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A: Fachverband Atomphysik

A 12: Atomic Clusters I

A 12.5: Vortrag

Mittwoch, 10. März 2010, 15:30–15:45, F 303

Electronic Structure of Transition Metal Doped Gold Clusters — •Konstantin Hirsch¹, Jochen Rittmann², Vicente Zamudio-Bayer¹, Marlene Vogel¹, Jörg Wittich¹, Silvia Forin¹, Christian Kasigkeit¹, Felix Ameseder¹, Jürgen Probst¹, Thomas Möller¹, Bernd von Issendorff³, and Tobias Lau² — ¹Technische Universität Berlin, Institut für Optik und Atomare Physik, EW 3-1, Hardenbergstraße 36, D-10623 Berlin — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Wilhelm-Conrad-Röntgen Campus / BESSY II, Institut für Methoden und Instrumentierung der Synchrotronstrahlung, Albert-Einstein-Str. 15, D-12489 Berlin — ³Albert-Ludwigs-Universität Freiburg, Fakultät für Physik/FMF, Stefan-Meier-Straße 21, D-79104 Freiburg

Small gold clusters show very suprising properties, like highly enhanced catalytical activity. The electronic properties of small clusters can be modified by doping with transition metal atoms. We investigated the local electronic structure of small doped gold clusters (Au_nM n=1-8, M=Sc,Ti,V,Cr) by means of X-ray absorption spectroscopy. The electronic structure is very sensitive to the doping and geometric structure of the cluster. A clear transition from planar to three dimensional geometric structures can be observed, since distinct atomic like features in the spectra vanish if the cluster undergoes the geometric transition. The spectra change dramatically upon successive addition of gold atoms to the cluster. Even electron localization in chromium doped gold clusters can be observed.