Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.49: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Determination of the mean cluster size and evolution of excitonic valence states by fluorescence from homogenous Ne, Ar and Kr clusters — •Xaver Holzapfel, Andreas Hans, Gregor Hartmann, Christian Ozga, Philipp Schmidt, Philipp Reiß, Arno Ehresmann, and André Knie — Institut für Physik und CINSaT, HeinrichPlett-Str. 40, D-34132 Kassel, Germany

Finite aggregates like clusters are used to study microscopic phenomena, in the range between molecular and condensed matter physics. The average size of clusters is their most important quantity for fundamental investigations. For clusters produced by supersonic expansion, the average cluster size is usually estimated indirectly by an empirical law involving the expansion parameters. Here we present a direct method to measure the mean cluster size by resonant excitation of outer valence electrons and the subsequent emission of fluorescence photons from homogenous Ne, Ar and Kr clusters. This method has been compared to the average cluster size determination by the empirical law. The collected data reveals new excitonic valence states and enables additional and more precise insights into the evolution of cluster states by scaling the mean size from the molecular to condensed matter regions.