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A: Fachverband Atomphysik
A 34: Poster II
A 34.7: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster
Angle resolved photoelectron spectroscopy of small aluminum clusters — •Adam Piechaczek, Christian Hock, Raphael Kuhnen, Christof Bartels, and Bernd v.Issendorff — Fakultät für Mathematik und Physik, Universität Freiburg, Stefan-Meier Str.19, 79104 Freiburg
Angle and energy resolved photoelectron spectroscopy of small, size-selected Aln− clusters (n=3…12)
has been performed. The electrons are photodetached by a ns laser pulse with photon wavelengths between 308 nm and 645 nm.
The photoelectron angular distributions (PADs) of the outgoing electrons contain information about the angular momentum
character of the bound state electrons. In the case of one photon excitation the PADs can be described by a single anisotropy parameter β. This parameter has been extracted for transitions from electrons detached from different bound states of the clusters as a function of photon energy. The data is compared to our results for sodium clusters. In contrast to sodium, aluminum has three valence electrons per atom, and the influence of the lattice is expected to be much stronger than in the case of sodium.