Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 30: Poster: Interaction with VUV and X-ray light

A 30.13: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

X-ray spectroscopy of chemical systems in liquids phase — •Zhong Yin^1,2, Simone Techert¹, Ivan Rajkovic¹, Katharina Kubicek^1,2, Alexander Föhlisch^3,4, Philippe Wernet³, and Wilson Quevedo³ — ¹Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany — ²Deutsches-Elektron Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany — ³Helmholtz Zentrum Berlin, Albert-Einstein-Strasse 15, 12489 Berlin, Germany — ⁴University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany

Based on their ability to salt in or salt out macromolecules salt ions are classified according to the Hofmeister series. While the macroscopic effect is known for over 100 years, the origin of the effect on the molecular level is still not understood. We present X-ray emission spectroscopy (XES) on the oxygen K-edge of water in aqueous solutions of inorganic salts using BESSY II synchrotron (Berlin, Germany) X-rays. The FlexRIXS end station utilized a liquid micro jet for sample delivery. The element- and site-specific XES method contains information about occupied and unoccupied molecular orbitals and is therefore sensitive to the chemical environment. The aim of our measurements was to reveal the influence of the water-ion interactions on the local water structure further elucidating the understanding of the structure maker and structure breaker concept. Structural changes while utilizing different salts were expected to show as spectral changes in the oxygen K-edge spectra, e.g. of peak shapes or intensities.