Abstract
A conceptually different approach to obtaining EXAFS data is being developed at SSRL which should increase the efficiency of data collection and minimise the effects of beam instabilities. Furthermore, a high-speed system of this type should permit time-resolved studied to be performed on chemical and biophysical systems. Polychromatic radiation is used to record a complete EXAFS spectrum simultaneously in a dispersive mode rather than the normal point-by-point measurement. We utilise a cylindrically bent triangular Si (111) crystal (capable of providing energy ranges of greater than 1000 eV) to disperse the quasi-parallel polychromatic beam. This energy dispersed beam converges to a focus at the sample position; the beam transmitted through the sample then diverges towards an X-ray detector. The position of the beam, incident on the detector, can be correlated to energy. An energy dispersive EXAFS camera has been designed and built and has been used to obtain EXAFS spectra in a few seconds from a number of metal foils. The resolution of EXAFS features was found to be better than 5 eV. A detailed description of the camera and data obtained with this technique will be presented.
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