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High energy resolution fluorescence detected x-ray absorption spectroscopy: a new powerful structural tool in environmental & geochemistry sciences

Abstract : The study of the speciation of highly-diluted elements by X-ray absorption spectroscopy is experimentally extremely challenging, especially in geochemistry, environmental bio-geochemistry and Earth sciences. Here we present an innovative synchrotron spectroscopy technique, namely high energy resolution fluorescence detected X-ray absorption spectroscopy (HERFD-XAS). Within this approach, measuring the XAS signal in fluorescence mode with a Crystal Analyser Spectrometer (CAS), with a ~1 eV energy resolution, allows to overcome the restrictions on sample concentrations that can be typically conventionaly measured (Proux et al. 2017). On the BM30b beamline (ESRF, Grenoble, France), we developed a CAS in the Johann’s geometry (Llorens et al., 2012). This spectrometer is now on a dedicated beamline (BM16) and opened to regular users since January 2017. The new opportunities brought by this high resolution spectroscopy are i) the possibility to study ultra-diluted elements by filtering with a great efficiency the background photons and ii) to improve the sensitivity of the measurement with the acquisition of better resolved XANES spectra. This is a major technological advance with strong benefits for the study of highly-diluted elements with XAS, and opens new possibilities to explore the speciation of a target chemical element at natural concentration levels, which is critical in the fields of environmental and bio-geochemistry sciences. Llorens et al. (2012) Rev. Sci. Instrum. 83:063104 Proux et al. (2017) J. Environ. Quality (in press).
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https://hal-cnrs.archives-ouvertes.fr/hal-03540519
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Submitted on : Monday, January 24, 2022 - 9:43:55 AM
Last modification on : Wednesday, March 23, 2022 - 3:24:06 PM

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  • HAL Id : hal-03540519, version 1

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Eric Lahera, William Delnet, Isabelle Kieffer, M. Rovezzi, Olivier Proux, et al.. High energy resolution fluorescence detected x-ray absorption spectroscopy: a new powerful structural tool in environmental & geochemistry sciences. Goldschmidt2017, 2017, Paris, France. ⟨hal-03540519⟩

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