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Figure 1
Sketch of the geometry of diffraction from a thin crystal in (a) Bragg geometry and (b) Laue geometry. The crystal of thickness τ, with the Bragg vector [{\bf H}] and the surface normal [{\bf n}], is represented in grey with the white stripes parallel to the Bragg diffraction planes. The wavevector of the incident and transmitted beam is [{\bf k}_{0}], while that for the diffracted beam is [{\bf k}_{H}]. The incident angle θ, the asymmetry angle δ and the angle differences [\beta _{0}] and [\beta _{H}] are indicated. P is a reference point on the crystal entrance surface. (c) Illustration of the coordinate system (x,z) for the incoming and transmitted beam, and [(x^{{\prime}}, z^{{\prime}})] for the diffracted beam. [\theta _{\rm ref}] is the incidence angle for the z direction.

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ISSN: 2053-2733
Volume 74| Part 2| March 2018| Pages 75-87
https://doi.org/10.1107/S2053273318001419
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