Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 20: Electronic Spectroscopy 2

MO 20.2: Talk

Thursday, March 20, 2014, 16:45–17:00, BEBEL SR144

The Hydrogen Bond of Water in Mixtures with Organic Solvents and in Aqueous Ion Solutions — •Kathrin Maria Lange, Tristan Petit, Gerrit Conrad, Kenji Yamamoto, Christoph Schwanke, Kai Hodeck, Markus Dantz, Tim Brandenburg, Edlira Suljoti, and Emad Flear Aziz — Helmholtz-Zentrum Berlin, Germany

Knowledge about the hydrogen bond network of water is essential for understanding its anomalies as well as its special role for several biochemical systems. Soft X-ray absorption (XAS) and emission spectroscopy (XES) as well as resonant inelastic X-ray scattering (RIXS) at the oxygen K-edge of water allow investigating its local electronic structure by probing the occupied- and unoccupied-valence molecular orbitals. The recent combination of these methods with the liquid microjet technique opened the door to studies of the hydrogen bond nature in a membrane-free spectrometer.[1-4] The effect of confining water in organic solvents free from oxygen[2], replacing hydrogen by deuterium [3] as well as of dissolving monovalent cations (Li+, K+, NH4+, Na+) [4] on the hydrogen bond structure of water was characterized. For the ionic solutions cation ordering with respect to their impact on hydrogen bond network was revealed and the effect of the counterion was investigated. [1] Lange et al., Chemical Physics 377, 1-5 (2010) [2] Lange et al., Angewandte Chemie 123, 45, 10809 (2011) [3] Lange et al., Phys. Rev. B 85, 155104 (2012) [4] Petit, Lange, Conrad, Yamamoto, Schwanke, Hodeck, Dantz, Brandenburg, Suljoti, Aziz, Submitted 2013