Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Atomic clusters (with MO)

A 2.2: Vortrag

Montag, 23. März 2015, 12:00–12:15, M/HS1

Experimental determination of absolute cross sections for cluster-specific decay mechanisms — •Andreas Hans1, André Knie1, Marko Förstel2, Philipp Schmidt1, Uwe Hergenhahn2, and Arno Ehresmann11Institut für Physik, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel — 2Max-Planck-Institut für Plasmaphysik, c/o HZB-Bessy II, Albert-Einstein-Straße 15, 12489 Berlin

The knowledge of absolute values for cross sections of specific processes is of high interest in many fields of physics and especially for applications. In atomic clusters, decay mechanisms can differ significantly from those dominant in atoms. Absolute cross sections of these processes are attractive in many contexts, e.g. in astrophysics or applications of interatomic Coulombic decay (ICD). We present a new method to determine absolute cross sections for cluster-specific decay mechanisms using photon-induced fluorescence spectroscopy of a partially condensed gas jet. Once calibrated, this method also allows the characterization of cluster jets. In a first experiment, absolute cross sections of resonant ICD in Ne clusters and photon emission after inner-valence excitation in Ar clusters were measured.

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