Hamburg 2009 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 13: Molekülphysik Poster 1
MO 13.35: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 8 Foyer
X-ray absorption spectroscopy of size selected protonated water clusters — •Jürgen Probst1, Konstantin Hirsch1, Andreas Langenberg1, Robert Richter1, Jochen Rittmann1, Marlene Vogel1, Vicente Zamudio-Bayer1, Thomas Möller1, Philippe Wernet2, Bernd von Issendorff3, and Tobias Lau1 — 1Technische Universität Berlin, Institut für Optik und Atomare Physik, EW 3-1, Hardenbergstraße 36, D-10623 Berlin — 2BESSY GmbH, Albert-Einstein-Straße 15, D-12489 Berlin — 3Universität Freiburg, Fakultät für Physik, Stefan-Meier-Straße 21, D-79104 Freiburg
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 structure of protonated water clusters. We have recently set up a water cluster source compatible with our liquid nitrogen cooled ion trap for core level spectroscopy. Preliminary results on size selected H+(H2O)n (n=4–14) clusters indicate a size dependent shift of the resonant x-ray absorption lines. Spectral signatures in this size range are closer to gas-phase water molecules or the ice Ih surface than to liquid water. We will present the experimental setup and discuss our results in comparison to theory and experiments on gas phase water molecules, liquid water, and ice.