Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 37: Atomic clusters

A 37.2: Hauptvortrag

Donnerstag, 15. März 2012, 14:30–15:00, V57.05

Autoionization of clusters: Energy transfer vs. electron transfer — •Uwe Hergenhahn — Max-Planck-Institut für Plasmaphysik, EURATOM Association, 85748 Garching

In this talk I will give a progress report about our experimental work on autoionization of clusters. The discovery of autoionizing decays into charge separated two-hole sites in clusters (Interatomic/Intermolecular Coulombic Decay, ICD) has been followed by experiments, in which such decays are mediated by charge transfer between sites (Electron Transfer Mediated Decay, ETMD). For ICD, which proceeds by energy transfer, evidence for the occurence of this process as a second step in a cascade after normal Auger decay of water clusters will be presented. For ETMD, the interpretation of outer valence and electron,electron coincidence spectra allows to get a comprehensive picture of this autoionization channel in ArXe clusters of varying size.