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Figure 1
In diffraction experiments, one can measure the same magnitude momentum transfer [|{\bf Q}_{1}| = |{\bf Q}_{2}|] in different detectors. From the conservation of momentum in the two cases one can find that different wavelengths (or wavevectors) were used. In addition, the orientation of the two momentum transfer vectors is different, so in order to satisfy the Bragg diffraction conditions the sample must be rotated. The incident flux is generally different at different wavelengths.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 55| Part 6| December 2022| Pages 1514-1527
https://doi.org/10.1107/S1600576722009645
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