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Figure 3
The X-ray energy dependence of the critical radii given by equation (1)[link] for several reflections of diamond and silicon. The point at each curve marks an energy such that, for a crystal thickness 20 µm and distance to detector 1 m, the width of the beam diffracted from the bent crystal is equal to the width of the first Fresnel zone. The Fraunhofer approximation is applicable, under these conditions, for energies smaller than the marked energy (see Section 5[link] for details).

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ISSN: 2053-2733
Volume 76| Part 1| January 2020| Pages 55-69
https://doi.org/10.1107/S2053273319014347
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