An exchangeable Bragg/Laue polychromator for energy-dispersive XAFS

• Published in: Journal of synchrotron radiation Vol. 5; no. 6; pp. 1396 - 1397
• Main Authors: San-Miguel, A., Hagelstein, M., Borrel, J., Marot, G., Renier, M.
• Format: Journal Article
• Language: English
• Published: 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.11.1998
• Subjects: energy-dispersive; monochromators; XAFS
• ISSN: 1600-5775; 0909-0495; 1600-5775
• DOI: 10.1107/S0909049598011315

An original design for a cooled exchangeable polychromator for energy‐dispersive XAFS (X‐ray absorption fine structure) working either in the transmission configuration (Laue case) or in the reflection configuration (Bragg case) is presented. It enables the acquisition of X‐ray absorption spectra between 5 and 25 keV with a spot size on the sample that can reach to less than 20 µm FWHM for some energies. Only 1 h is needed to exchange both benders in operative mode. Parallel transmission spectra with a bandpass between 5 and 10% can be obtained in the full energy range. The dispersive optics and mechanics of ID24 (ESRF, Grenoble, France) have been designed to obtain XAFS spectra in less than 1 s and, in some cases, in the millisecond range.