Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 10: Posters: Atomic clusters
A 10.12: Poster
Tuesday, March 11, 2008, 16:30–18:30, Poster C3
Photoelectron spectroscopy of oxidized sodium clusters — •Kiran Majer and Bernd von Issendorff — Department of Physics, University of Freiburg, Stefan-Meier-Straße 21, 79104 Freiburg
The electronic structure of medium sized sodium dioxide clusters (NanO2−, n: number of sodium atoms) was investigated by photoelectron spectroscopy (PES). For cluster sizes containing up to 62 sodium atoms, the PES show comparable features (e.g. appearance of a new electronic shell) like for pure sodium clusters, but shifted in size by 4 sodium atoms towards bigger sizes. In the Jellium model picture, this can be explained by the localization of four electrons by the oxygen atoms.
This shift can not be found for bigger clusters with n ≥ 92. In particular the electronic magic number 92 seems to be reached at the Na93O2− cluster, implying that the oxygen locates only 2 delocalized electrons.
The aim of the study was to find more information about the electronic and geometric structure of the oxidized cluster, as well as how it is influenced by the dopant.