Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Dynamics of Molecular Systems

CPP 6.3: Vortrag

Montag, 26. März 2007, 15:00–15:15, H47

The electronic structure and the hydrogen bond network of H2O and D2O studied by X-ray emission (XES) and X-ray absorbtion spectroscopy (XAS) in the soft X-ray range — •Monika Blum1, Oliver Fuchs1, Markus Weigand1, Florian Maier1, Eberhard Umbach1, Lothar Weinhardt2, Marcus Bär2, Clemens Heske2, Michael Zharnikov3, Michael Grunze3, and Jonathan Denlinger41Universität Würzburg, Experimentelle Physik II, 97074 Würzburg — 2Dept. of Chem., University of Nevada, Las Vegas — 3Angew. Physikal. Chemie, Uni Heidelberg — 4ALS, Berkeley

The investigation of liquids by means of soft x-ray techniques is a technically challenging task since it requires a third generation synchrotron source combined with a high efficiency grating spectrometer and a wet cell with an ultra-thin window separating the liquid from ultra-high vacuum. With our flow-through wet cell we have investigated the electronic structure of various liquids including H2O, D2O, NaOH and NaOD.

The molecular dynamics within the time scale of the core hole lifetime (a few femtoseconds) lead to isotope and temperature effects of the measured liquids in both, XES and XAS spectra. These effects can be analyzed by the comparison of the XES spectra of H2O and D2O. Two different species can thus be identified. The observed isotope, energy and temperature dependent effects can be explained by these species involving tunneling processes within the hydrogen bond network.

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