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Figure 1
A quasi-parallel and polychromatic beam, supplied by a synchrotron radiation source, is energy dispersed and focused by an elliptical curved crystal. Since the incident X-rays strike the crystal at slightly different angles along its length, the bent crystal acts as a polychromator diffracting at different energies at each point. The energy-dispersed beam converges to a point where the sample (for example in a DAC) is placed. The beam, transmitted through the sample, then diverges towards a position-sensitive detector. The source and the image are at the two foci of an ellipse. The position of the beam, on the detector, can be directly correlated to energy. By measuring the spatial X-ray intensity in the presence (I1) and absence (I0) of the sample, an X-ray absorption spectrum can be consequently obtained by taking the logarithm of the ratio of the I0 and I1 data. Inset: scheme of a DAC.

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ISSN: 1600-5775
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