Hamburg 2009 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Cluster
MO 14.8: Vortrag
Mittwoch, 4. März 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 Förstel1,3, 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)