Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 2: Electronic Spectroscopy
MO 2.7: Vortrag
Montag, 12. März 2012, 12:00–12:15, V38.02
Resonant x-ray emission spectroscopy as a tool to study the Hofmeister series in liquids — •Zhong Yin1, Katharina Kubicek1, Ivan Rajkovic1, Wilson Quevedo1, Brian Kennedy2, Kristjan Kunnus3, Simon Schreck3, Franz Hennies2, Philippe Wernet3, Alexander Föhlisch3,4, and Simone Techert1 — 1Max-Planck-Institut für biophysikalische Chemie, Am Faßberg 11, 37077 Göttingen, Germany — 2MAX-Lab, Lund University, 22100 Lund, Sweden — 3BESSY, Albert-Einstein-Straße 15, 12489 Berlin, Germany — 4Uniersität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam, Germany
Understanding the role of inorganic salts in chemical and biological systems is one of the intriguing objectives in current chemical research. Based on their relative entropies of solvation and on their ability to salt-out proteins or denature proteins ions could be classified to be structure makers or breakers (Hofmeister series). The fundamentals underlying this behavior still "remain[s] unexplained by present theories of physical chemistry". Furthermore, static soft XAS measurements yielded sometimes conflicting results. Recently we performed static x-ray emission spectroscopy (XES) experiments at synchrotrons. The differences in the water oxygen K-edge spectra of liquid water and different aqueous salt solutions were studied, tuning the photon energy, thus addressing core-levels in an element- and site-specific way. Data analysis is currently ongoing and shows already promising, intermediate results which should significantly contribute to our understanding of solution chemistry.