Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 9: Poster Session - Atomic Physics I

A 9.13: Poster

Monday, March 9, 2020, 16:00–18:00, Empore Lichthof

Investigation of Frenkel excitons located in the valence shell of homogeneous and heterogeneous noble gas clusters — •Xaver Holzapfel, Andreas Hans, Gregor Hartmann, Christian Ozga, Philipp Schmidt, Arno Ehresmann, and André Knie — Institut für Physik und CINSaT, Universität Kassel, Heinrich- Plett-Str. 40, 34132 Kassel, Germany

Electronic excitations in the valence shell of homogeneous and heterogeneous clusters were studied by fluorescence spectroscopy. Information about excitonic states as well as the mean cluster size of the cluster distribution created by supersonic expansion were obtained by measuring the fluorescence excitation yield in the UV and VUV spectral range. Using a multidimensional fitting algorithm, the mean cluster size was determined from the surface and bulk contributions of all measured fluorescence spectra. Furthermore, differently shaped cluster distributions were included in the analysis of the mean cluster sizes. The comparison of measured mean cluster sizes to the scaling laws and to investigations on heterogeneous systems indicated excitonic states which are different from the commonly used assignment of solid state experiments.