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Hannover 2010 – scientific programme

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MO: Fachverband Molekülphysik

MO 33: Cluster II

MO 33.1: Talk

Friday, March 12, 2010, 14:00–14:15, F 102

The observation of electronic energy bands in argon clusters — •Marko Förstel1,2, Melanie Mucke1, Tiberiu Arion1, Toralf Lischke1, Alex Bradshaw1,3, and Uwe Hergenhahn11Max-Planck-Institut für Plasmaphysik, 85748 Garching — 2Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 3Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin

We have investigated the 3p valence band of argon clusters near the photoionization threshold. Detection of low kinetic energy electrons was achieved by using a newly constructed magnetic bottle type spectrometer. Ar clusters were produced in a supersonic expansion. In our experiments, we have varied the expectation value of the cluster size distribution, ⟨ N⟩, from 50-1000 atoms by changing the expansion conditions. A strong feature at ca. 15 eV binding energy shows a photon energy dependence typical of electronic energy band dispersion. A feature with a similar dispersion occurs in the ordered solid at approximately the same photon energy. This first observation of band dispersion in a rare gas cluster indicates that bulk-like electronic properties are already present in clusters of a few hundred atoms. The cluster size dependence of the dispersion will be discussed in the presentation.

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