Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.16: Poster
Monday, February 25, 2008, 18:30–19:30, Poster F
Comparing Resonant 2p X-ray Absorption of Size-selected Cobalt Clusters on Cu(100) and in a Linear Paul Trap — •Vicente Zamudio-Bayer1, Leif Glaser2, Konstantin Hirsch1, Philipp Klar1, Andreas Langenberg1, Fabian Lofink1, Robert Richter1, Jochen Rittman1, Marlene Vogel1, Wilfried Wurth2, Thomas Möller1, Bernd von Issendorff3, and J. Tobias Lau1 — 1Technische Universität Berlin, Institut für Optik und Atomare Physik, EW 3-1, Hardenbergstraße 36, D-10623 Berlin — 2Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, D-22761 Hamburg — 3Albert-Ludwigs-Universität Freiburg, Fakultät für Physik/FMF, Stefan-Meier-Straße 21, D-79104 Freiburg
Its element specificity makes resonant X-ray absorption spectroscopy an ideal tool to study deposited clusters at low coverage. At the 2p absorption edges of small, size-selected cobalt clusters on Cu(100), two separate sets of lines are observed which can be interpreted in terms of atomic-like multiplet splitting. For very small clusters (n=1, 2, 3), these absorption lines show a strong size dependence. The size evolution of 2p X-ray absorption will be discussed in comparison to size-selected free cobalt clusters, recorded recently on mass selected cluster ions in a linear Paul trap at BESSY. Direct comparison of free and deposited clusters under well defined conditions allows to distinguish size-specific properties from cluster–substrate interaction effects. A shift to higher photon energies in deposited clusters indicates screening by substrate valence electrons.