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Hannover 2010 – wissenschaftliches Programm

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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 Lau21Technische 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 (AunM 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.

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