High energy resolution five-crystal spectrometer for high quality fluorescence and absorption measurements on an x-ray absorption spectroscopy beamline.

Abstract

Fluorescence detection is classically achieved with a solid state detector (SSD) on x-ray absorption spectroscopy (XAS) beamlines. This kind of detection however presents some limitations related to the limited energy resolution and saturation. Crystal analyzer spectrometers (CAS) based on a Johann-type geometry have been developed to overcome these limitations. We have tested and installed such a system on the BM30B/CRG-FAME XAS beamline at the ESRF dedicated to the structural investigation of very dilute systems in environmental, material and biological sciences. The spectrometer has been designed to be a mobile device for easy integration in multi-purpose hard x-ray synchrotron beamlines or even with a laboratory x-ray source. The CAS allows to collect x-ray photons from a large solid angle with five spherically bent crystals. It will cover a large energy range allowing to probe fluorescence lines characteristic of all the elements from Ca (Z = 20) to U (Z = 92). It provides an energy resolution of 1-2 eV. XAS spectroscopy is the main application of this device even if other spectroscopic techniques (RIXS, XES, XRS, etc.) can be also achieved with it. The performances of the CAS are illustrated by two experiments that are difficult or impossible to perform with SSD and the complementarity of the CAS vs SSD detectors is discussed.

DOI: 10.1063/1.4728414

Cite this paper

@article{Llorens2012HighER, title={High energy resolution five-crystal spectrometer for high quality fluorescence and absorption measurements on an x-ray absorption spectroscopy beamline.}, author={I. Llorens and Eric Lahera and William Delnet and Olivier Proux and Aur{\'e}lien Braillard and Jean-Louis Hazemann and Alain Prat and Denis Testemale and Quentin Dermigny and Fr{\'e}d{\'e}ric G{\'e}l{\'e}bart and Marc Morand and Abhay Shukla and Nathalie Bardou and Olivier Ulrich and St{\'e}phan Arnaud and Jean-François B{\'e}rar and Nathalie Boudet and Bernard Caillot and Perrine Chaurand and J{\'e}r{\^o}me Rose and Emmanuel Doelsch and Philippe Martin and Pier Lorenzo Solari}, journal={The Review of scientific instruments}, year={2012}, volume={83 6}, pages={063104} }