Frankfurt 2006 – scientific programme

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MO: Molekülphysik

MO 13: Molecular Clusters I

MO 13.2: Talk

Monday, March 13, 2006, 14:15–14:30, H10

Photoelectron spectroscopy of strontium cluster anions — •Oleg Kostko¹, Ori Cheshnovsky², and Bernd v.Issendorff¹ — ¹Fakultät für Physik, Universität Freiburg, Stefan-Meier-Str. 21, 79104 Freiburg — ²School of Chemistry, The Raymond and Beverly Sackler Faculty of Sciences, Tel Aviv University, 69978 Tel Aviv, Israel

Size-selected strontium cluster anions with a temperature of T=100K have been studied by photoelectron spectroscopy. The spectra exhibit clear structures which in combination with ab initio DFT calculations can be used to identify the geometry of the clusters. Comparison of the photoelectron spectra with the spectra of other divalent metals such as magnesium and zinc shows clear distinctions. All of them exhibit a band gap for small sizes. But the photoelectron spectra of larger Mg and Zn clusters reveal free electron-like density of states, whereas in the case of Sr clusters an electron shell structure is not visible. This is the result of strong hybridization of the 5s band with the empty 4d band (instead of s-p hybridization like in Mg and Zn clusters), which perturbs the electron shell structure and leads to a high DOS at E_F even for smaller clusters.