Hamburg 2009 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Cluster

MO 14.8: Talk

Wednesday, March 4, 2009, 16:00–16:15, VMP 6 HS-F

Intermolecular Coulombic Decay in Water Clusters investigated with a Magnetic Bottle Spectrometer — •Melanie Mucke¹, Markus Braune², Silko Barth¹, Marko Förstel^1,3, Toralf Lischke¹, Volker Ulrich¹, Tiberiu Arion¹, Uwe Becker², and Uwe Hergenhahn¹ — ¹Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching — ²Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin — ³Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

To probe predictions [1] for Intermolecular Coulombic Decay in a biologically relevant environment, water clusters have been generated in a supersonic molecular expansion process. Electrons emitted after inner valence photoionisation by synchrotron radiation have been detected with a magnetic bottle type spectrometer. Analysis of coincident electron pairs gives the first experimental proof of IC Decay (a non-local autoionisation process) in hydrogen bonded matter. The energy spectrum of autoionisation electrons is featureless and ranges from 0 to 8 eV of kinetic energy.

[1] L.S. Cederbaum, J. Zobeley and F. Tarantelli, Giant Intermolecular Decay and Fragmentation of Clusters, Phys. Rev. Lett. 79, 4778-4781 (1997)