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MO: Fachverband Molekülphysik
MO 21: Electronic Spectroscopy I
MO 21.1: Talk
Thursday, March 17, 2011, 10:30–10:45, MER 02
Soft x-ray absorption spectroscopy on liquids, solutions and solvated molecules using ultrathin liquid films — •Simon Schreck, Christian Weniger, and Philippe Wernet — Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin
Soft x-ray absorption spectroscopy is a powerful technique for investigating the electronic structure of atoms and molecules. Here we present its application to bulk liquids, liquid solutions and solvated molecules to study the interplay of electronic and geometric structures.
Soft x-ray absorption spectra were recorded in transmission mode using a recently developed setup for preparing ultrathin liquid films separated from vacuum or He atmosphere. The thickness of these films can be controlled from the nanometer range to some micrometers.
We present spectra of the near edge x-ray absorption fine structure (NEXAFS) of the Oxygen (O) K-edge of H2O, D2O and aqueous solutions of 3d metal chlorides. For the 3d metal chlorides additional measurements were performed at the corresponding metal L-edges. The combined O K-edge and metal L-edge measurements on aqueous solutions allow for new interpretations in terms of the hydration of metal ions and their interaction with the solvent. Furthermore, spectra of the extended x-ray absorption fine structure (EXAFS) of H2O and D2O are presented. For D2O, these are the first NEXAFS spectra recorded with soft x-rays and the first EXAFS studies at all. The measurements were performed at the synchrotron radiation source BESSYII at the Helmholtz-Zentrum Berlin.