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Figure 1
(a) Observed Si220 topography from a weakly bent plane-parallel crystal. The intensity profile in Fig. 6[link](a) is obtained along the horizontal dashed line. (b) Optical geometry around the crystal. P0 and Ph represent the incident and the reflected beams, respectively. (c) Schematic illustration of the beam trajectories. [{\varphi _1}] is the angle between S1 and the lattice plane at A0. (d) The real part of the dispersion surface (thick solid line). The abscissa represents the X axis and the ordinate the [Z_{\rm r}] axis. L0 is the Lorentz point at ([{\kappa _{{\rm r}x}},h/2]). The part of the dispersion surface below d2 belongs to branch (1) and the part above d2 belongs to branch (2). The width of the shaded area corresponds to the divergent angle of the incident beam.

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ISSN: 2053-2733
Volume 78| Part 5| September 2022| Pages 422-429
https://doi.org/10.1107/S2053273322006143
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