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BP: Fachverband Biologische Physik

BP 3: Biopolymers and Biomaterials I (with CPP)

BP 3.9: Vortrag

Montag, 14. März 2011, 12:45–13:00, ZEU 222

Investigation of L-Cysteine in aqueous solution using the RIXS-map approach — •Frank Meyer¹, Lothar Weinhardt¹, Monika Blum², Marcus Bär³, Regan Wilks³, Wanli Yang⁴, Clemens Heske², and Friedrich Reinert¹ — ¹Exp. Physik VII, Universität Würzburg — ²Department of Chemistry, University of Nevada Las Vegas, USA — ³Solar Energy Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH — ⁴Advanced Light Source, Lawrence Berkeley National Laboratory, USA

Amino acids are the building blocks of many biologically relevant macro-molecules. Consequently, their electronic structure is of fundamental interest and hence has been the topic of many studies. Most investigations focus on solid-state samples, the study of amino acids in their native (i.e. aqueous) environment with core-level spectroscopy has only become possible as a result of the development of specialized experimental set-ups. In combination with a high-transmission soft x-ray spectrometer, our liquid flow through cell allows us to measure two-dimensional resonant inelastic x-ray scattering (RIXS) maps of liquids and solutions. RIXS maps display the x-ray emission intensity as a function of emission and excitation energy and hence provide a comprehensive picture of the electronic structure of the investigated material. In this contribution, we will present RIXS maps of aqueous cysteine solutions at various pH values. We observe a significant impact of the pH value and evidence for proton dynamics on the time scale of the RIXS process. The results are compared to RIXS and photoemission measurements of cysteine thin films and of related molecules.