The principle of the Energy Dispersive EXAFS (EDE) is based on the diffraction of non monochromatic X-rays by a bent crystal (polychromator crystal). The polychromatic beam is focused on the sample and then diverges towards a position sensitive detector where beam position is correlated to energy. The dispersive configuration of XAS has two main advantages that make it scientifically attractive. First, the whole x-ray absorption spectrum is collected simultaneously which makes the technique especially useful for the study of fast processes. Second, the size of the focussed beam at the sample position is small and very stable due to the fact that no movement of optical elements is required to collect the spectral data.
Some examples of science where this technique plays an important role are listed below.
 (a) M.A. Newton, A.J. Dent, S. Diaz-Moreno, S.G. Fiddy, J. Evans. Angewandte Chemie, International Edition in English, 41, 2587 (2002) (b) M. Tada and Y. Iwasawa, Annual Rewview of Materials Research, 35, 397 (2005).
I20 covers three very distinctive modes of operation: X-ray Absorption Spectroscopy (XAS) on challenging samples, X-ray Emission Spectroscopy (XES), and Energy Dispersive EXAFS (EDE). The beamline is equipped with two wigglers in the same straight section, one for the scanning branchline (I20-scanning) and the other for the dispersive branch (I20-EDE).More information
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