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A: Fachverband Atomphysik
A 34: Poster II
A 34.3: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster
X-ray photoionization spectroscopy of size selected aluminum cluster cations — •Marlene Vogel1, Konstantin Hirsch1, Andreas Langenberg1, Jürgen Probst1, Robert Richter1, Jochen Rittmann1, Vicente Zamudio-Bayer1, Thomas Möller1, Bernd von Issendorff2, and Tobias Lau1 — 1Technische Universität Berlin, Institut für Optik und Atomare Physik, EW 3-1, Hardenbergstraße 36, D-10623 Berlin — 2Universität Freiburg, Fakultät für Physik, Stefan-Meier-Straße 21, D-79104 Freiburg
X-ray absorption spectroscopy of size selected clusters has become feasible with the use of ion traps to increase target density and absorption length. Here we present first results on 2p X-ray absorption of size selected Aln+ (n=1–14) clusters. Cluster size dependent changes in the electronic and geometric structure can be deduced from the spectra. Since direct 2p photoionization is associated with a specific ion yield channel, direct and resonant photoionization can be distinguished, giving access to core level photoionization thresholds of size selected clusters for the first time. We will present first results and compare the size dependence of the aluminum 2p photoionization threshold to the image potential model.