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Figure 2
Sketches of Friedel pairs for different rotation axes. (a) The rotation axis is perpendicular to the incident direction. The diffraction spot and its pair appearing at ω and ω + 180° correspond to the angle between the normal vector of the (hkl) lattice plane and the negative of the incident direction being equal to 90° − θ and 90° + θ, respectively. (b) The pair of the diffraction spots appearing at ω do not appear at ω + 180° when the rotation axis is inclined.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 22| Part 4| July 2015| Pages 1062-1071
https://doi.org/10.1107/S1600577515006165
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