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Figure 12
Dispersion surfaces and diffraction geometry in the vacuum. The glancing angle α is taken to be the same as the Bragg angle [{\theta _{{\rm B}}}], for simplicity. T′0 and T′′0 represent the dispersion surface for the beam with [{{{\bf K}}_0}] and that with [{{{\bf K}}_0} + \delta{{{\bf K}}_E}], respectively. [T'_{\rm h}] represents the dispersion surface for the beam [{\bf K}_{\rm h}]. LaO, L′aO and AO represent the vectors [{\bf K}_0], [{\bf K}_0 + \delta({\bf K}_E)_{//}/\cos {\theta _{{\rm B}}}] and [{\bf K}_0 + \delta {\bf K}_\alpha], where [\delta({\bf K}_E)_{//}] is the component vector of [\delta {\bf K}_E] parallel to the lattice plane.

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ISSN: 2053-2733
Volume 75| Part 6| November 2019| Pages 842-850
https://doi.org/10.1107/S2053273319011859
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