Hannover 2010 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 33: Cluster II
MO 33.6: Vortrag
Freitag, 12. März 2010, 15:15–15:30, F 102
Protonated Water Clusters – a XAS Study — •J. Wittich2, J. Rittmann1, F. Ameseder2, K. Hirsch2, Ch. Kasigkeit2, A. Langenberg1, M. Leetmaa4, H. Öberg4, L.G.M. Pettersson4, J. Probst2, M. Vogel2, Ph. Wernet1, V. Zamudio-Bayer2, Th. Möller2, B. von Issendorff3, and J.T. Lau1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany — 2Technische Universität Berlin, Institut für Optik und Atomare Physik, Hardenbergstr. 36, 10623 Berlin, Germany — 3Universität Freiburg, Fakultät für Physik, Stefan-Meier-Str. 21, 79104 Freiburg, Germany — 4Stockholm University, Fysikum, AlbaNova, Stockholm, Sweden
The electronic and geometric structures of size selected protonated water clusters are studied with X-ray absorption spectroscopy at the oxygen K-edge. Transitions from oxygen 1s electrons into unoccupied molecular orbitals are particularly sensitive to hydrogen bonding of water molecules and give information on the local electronic structure of protonated water clusters. Results on size selected H+(H2O)n (n = 4 − 14) clusters indicate size dependent shifts of the resonant X-ray absorption lines. Spectral signatures in this size range are rather similar to gas-phase water molecules or the ice Ih surface than to liquid water. We will discuss our results in comparison to theory and experiments on gas phase water, liquid water, and ice. Additionally, an insight into our XAS studies on the coordination of solvated ions in water clusters will be given.