Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 7: Metal clusters
A 7.7: Talk
Tuesday, March 11, 2008, 12:45–13:00, 3D
X-ray Absorption Spectroscopy of Size-Selected Metal Clusters: Neutral Beam vs. Ion Trap — •Tobias Lau1, Konstantin Hirsch1, Philipp Klar1, Andreas Langenberg1, Fabian Lofink1, Robert Richter1, Jochen Rittmann1, Marlene Vogel1, Vicente Zamudio-Bayer1, Bernd von Issendorff2, and Thomas Möller1 — 1Technische Universität Berlin, Institut für Optik und Atomare Physik, Hardenbergstraße 36, D-10623 Berlin — 2Albert-Ludwigs-Universität Freiburg, Fakultät für Physik/FMF, Stefan-Meier-Straße 21, D-79104 Freiburg
Combining the element specific nature of inner-shell excitation with size-selected transition metal and semiconductor clusters yields a powerful technique to study cluster size and composition dependent changes in the electronic structure. Very recently, the first X-ray absorption spectra of free, size selected transition metal cluster cations could be recorded at the Berlin synchrotron radiation facility BESSY II. For small transition metal clusters (n ≤ 10), the evolution of the L2,3 edges from the monomer towards bulk can be followed atom by atom. While very small (n=2−4) transition metal clusters show structured spectra similar to the monomer cation, already around n=5 the clusters develop bulk-like X-ray absorption line shapes. These spectra will be discussed in comparison to XAS of size-selected, deposited clusters and of slightly larger transition metal clusters, investigated in a neutral beam.