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Figure 2
Schematic illustration of the diffraction experiment, introducing notations used in the text. The image shows the primary X-ray beam, Cartesian laboratory coordinate system e1 e2 (e3 is defined as their cross product). d0 and d are the unit vectors defining the direction of the detector normal and the direction from the crystal to the given detector pixel, respectively. The angle between these two vectors is defined as the oblique incidence angle η. D0 is the distance to the detector plane. xd, yd are the unit vectors defining the detector axes. Q and Q′ are the scattering vectors before and after rotation.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 59| Part 4| August 2026| Pages 1224-1237
https://doi.org/10.1107/S1600576726006187
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