ChemAtom Seminar

X-ray Raman spectroscopy and high-pressure water
X-ray Raman spectroscopy (XRS) is a useful tool for studying physical and chemical properties of matter. It gives the same information as soft-x-ray (<2 keV) X-ray absorption spectroscopy (XAS). XRS, however, is based on inelastic scattering of hard x-rays and studies can be thus done with hard x-rays (~10 keV). The use of harder x-rays allows studies in cases where soft x-rays are not applicable, such as high pressure cells and chemical reaction cells.
At European Synchrotron Radiation Facility (ESRF) beamline ID20, a world-leading dedicated spectrometer [1] for XRS is available. Currently ESRF is being upgraded to ESRF-EBS (Extremely Brilliant Source), and will open for users again in 2020. The x-ray beam can be focused to ~10 micron level and the energy resolution is ~0.5 eV. The scattered x-rays are collected with a large-solid-angle spectrometer with variable scattering angles. We have used XRS for studies of water and other liquids in various thermodynamic conditions, Li-ion battery research, catalysis research, and in-situ hydrogen storage, to name a few examples.
In this talk some capabitilities of XRS are shown with recent results.

 [1] Simo Huotari, Christoph Sahle, Christian Henriquet, Ali Al-Zein, Keith Martel, Laura Simonelli, Roberto Verbeni, Herve Gonzalez, Marie-Claire Lagier, Cyril Ponchut, Marco Moretti Sala, Michael Krisch, Giulio Monaco: A large-solid-angle X-ray Raman scattering spectrometer at ID20 of the European Synchrotron Radiation Facility, J. Synchrotron Radiat. 24, 521 (2017)