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MO: Fachverband Molekülphysik
MO 10: Cluster
MO 10.1: Talk
Tuesday, March 15, 2011, 10:30–10:45, MER 02
Electron transfer mediated decay in Ar-Kr clusters — •Marko Förstel1, Melanie Mucke1, Tiberiu Arion1, Alex M. Bradshaw1,2, and Uwe Hergenhahn1 — 1Max-Planck-Inst. für Plasmaphysik, Albert-Einstein-Str. 15, 12489 Berlin, Germany — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Non-local autoionization processes in weakly bonded systems are receiving an increasing amount of attention, due to their universal appearance in clusters and liquids, and due to their interdisciplinary relevance. Most investigations have addressed Interatomic Coulombic Decay (ICD), in which a primary vacancy decays to a charge-separated two-hole state by ultra-fast energy transfer to a neighbouring site. In some systems however, autoionization into charge-separated states can also be mediated by electron transfer. This so-called Electron Transfer Mediated Decay (ETMD) connects different sites in a weakly bonded system solely by electron correlation, and leads to concerted changes in the electronic structure on a fs time scale. So far it has only been described theoretically. Here we present a clear demonstration of ETMD(3), an autoionization channel in which three different sites take part simultaneously. We recorded electron-electron coincidence spectra of Ar-Kr clusters after photoionization. An electron with the kinetic energy range from 0 to approx. 1 eV is found in coincidence with the Ar 3s cluster electron. This low kinetic energy electron can be attributed to a Ar+Kr++Kr+ final state which forms after electron transfer mediated decay.