Publication
Reference
Lahera Eric, Bazarkina Elena, Del Net William, Kieffer Isabelle, Rovezzi Mauro, Proux Olivier, Testemale Denis, Irar Mohammed, Thomas Sara, Aguilar-Tapia Antonio, Prat Alain, Tella Marie, Auffan Mélanie, Rose Jérôme, Hazemann Jean-Louis (2017). HERFD-XAS : a new powelful structural tool in environmental and geochemistry sciences. Goldschmidt, 2170 (abstract).
Names
  • Eric Lahera
  • Elena Bazarkina
  • William Del Net
  • Isabelle Kieffer
  • Mauro Rovezzi
  • Olivier Proux
  • Denis Testemale
  • Mohammed Irar
  • Sara Thomas
  • Antonio Aguilar-Tapia
  • Alain Prat
  • Marie Tella
  • Mélanie Auffan
  • Jérôme Rose
  • Jean-Louis Hazemann
Article and keywords
Title
HERFD-XAS : a new powelful structural tool in environmental and 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. Within this approach, measuring the XAS signal in fluorescence mode with a Crystal Analyser Spectrometer (CAS), with a ~1 eV energy resolution, for photons energy ranging from 4 to 18 keV. Due to this new tool many restrictions on sample concentrations and multi-fluorescence interferences may be overcomed (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, up to the ppm level compare to the typical 10-20 ppm that can be conventionaly measured. CAS 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.
Keywords
Br, HERFD
Content
sample, spectral data
Document type
conference abstract
Year
2017
Pages
2170
Name
Goldschmidt
Location
Paris
Dates
2017 August 13-18
Publication state
published
Comments
None
Identifiers
  • URL: 
  • bibcode: 
Experiment/Spectra