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A: Fachverband Atomphysik
A 34: Poster II
A 34.11: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster
Photoelectron spectroscopy of potassium cluster anions — •Kiran Majer, Lei Ma, and Bernd von Issendorff — Institute of Physics, University of Freiburg, Stefan-Meier-Straße 21, 79104 Freiburg
The electronic structure of medium sized potassium clusters (Kn−, n: number of potassium atoms) was investigated by photoelectron spectroscopy (PES). The obtained spectra can be compared size by size with spectra of sodium clusters from previous measurements. Especially the electronically signalized cluster sizes (e.g. shell closings) bear resemblance. Nevertheless there are other sizes which lack of any similarities.
Both, Potassium and Sodium pertain to the alkali metals. They posses a s1 valence electron and a rare gas electron core configuration, which make the bulk alkalis to the simplest of metals. For these "free electron" systems one can expect similarities in spectral features of the PES. However, the deviations show, that the geometrical structure of cluster, even for the simple metals, can have an essential influence on his electronic configuration.