Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 19: Atomic clusters I
A 19.9: Vortrag
Donnerstag, 17. März 2011, 12:45–13:00, BAR 205
X-ray and VUV Absorption Spectroscopy on Size Selected Chromium and Copper Clusters — •Felix Ameseder2, Christof Ebrecht2, Konstantin Hirsch2, Christian Kasigkeit2, Andreas Langenberg1, Markus Niemeyer2, Jochen Rittmann1, Vicente Zamudio-Bayer1, Marlene Vogel1, Bernd von Issendorff3, Thomas Möller2, and Tobias Lau1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Institut für Methoden und Instrumentierung der Synchrotronstrahlung, Albert-Einstein-Straße, D-12489 Berlin — 2Technische Universität Berlin, Institut für Optik und Atomare Physik, EW 3-1, Hardenbergstraße 36, D-10623 Berlin — 3Albert-Ludwigs-Universität Freiburg, Fakultät für Physik/FMF, Stefan-Meier-Straße 21, D-79104 Freiburg
Studies on clusters reveal important information, including changes of the electronic structure from atomic to bulk like properties with increasing cluster size. Here we present the first X-ray and VUV absorption spectra on free size selected chromium and copper clusters. The clusters 2nd ionization potentials were determined from photoionization efficiciency curves. According to the Liquid Drop Model (LDM) a metal cluster can be described as a metallic sphere and thus its ionization potential scales linearly with cluster size over the inverse cluster radius. The results of 3d/4s valence and 2p core level photoionization will be discussed. By comparing the size dependence of the ionization potential derived from valence and core level photoionization insight into the effects of charging energy according to the LDM as well as shifts of electronic level of transition metal clusters can be obtained.