High energy resolution fluorescence detected x-ray absorption spectroscopy: a new powerful structural tool in environmental & geochemistry sciences - Archive ouverte HAL Access content directly
Conference Papers Year :

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

, , , , , (1) , , , , , (2) , , (1)
1
2
Eric Lahera
  • Function : Author
William Delnet
  • Function : Author
Isabelle Kieffer
M. Rovezzi
  • Function : Author
Olivier Proux
Denis Testemale
Antonio F Aguilar-Tapia
  • Function : Author
E. F. Bazarkina
  • Function : Author
Alain Prat
  • Function : Author
Marie Tella
  • Function : Author
Jérôme Rose

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).
Not file

Dates and versions

hal-03540519 , version 1 (24-01-2022)

Identifiers

  • HAL Id : hal-03540519 , version 1

Cite

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⟩
12 View
1 Download

Share

Gmail Facebook Twitter LinkedIn More