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Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 31: Molecular Films: Properties and Preparation

O 31.2: Talk

Tuesday, April 1, 2014, 10:45–11:00, WIL A317

X-ray spectroscopic analysis of the electronic structure of aqueous salt solutions — •Yekkoni Jeyachandran1, Frank Meyer2, Andreas Benkert2,3, Marcus Bär4,5, Regan Wilks4, Monika Blum5, Wanli Yang6, Friedrich Reinert2, Clemens Heske3,5, Lothar Weinhardt3,5, and Michael Zharnikov11Angew. Phys. Chemie, Universität Heidelberg. — 2Exp. Phys. VII, Universität Würzburg. — 3Inst. Photon Sci. Synchr. Rad., Karlsruhe Institute of Technology. — 4Sol. Energy Res., Helmholtz-Zentrum Berlin. — 5Dept. Chem., University of Nevada Las Vegas. — 6Advanced Light Source, Lawrence Berkeley National Laboratory.

Modification of the molecular structure of water in the presence of ionic salts is of primary importance for a variety of chemical and biochemical processes. Advanced soft X-ray spectroscopic techniques, which provide information on the local electronic structure of molecules, can be used to probe such a modification. In this work, using a specially designed experimental setup, we studied the electronic structure of water molecules in aqueous alkali halide and calcium chloride solutions by non-resonant and resonant X-ray emission spectroscopy (XES). Significant changes in the characteristic emission spectra of water were observed at the variation of the salt concentration, with the extent and character depending on the size and valence state of the involved anions and cations. The observed spectral changes are discussed in terms of the disturbances of the hydrogen bond network of water molecules induced by the salts. These changes are accompanied by the changes in the electronic structure of water, which can be traced by XES.

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