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Figure 4
Illustrations of Criteria 3[link] and 4[link] in CBED patterns with Bijvoet pairs satisfying the three-beam conditions. The CBED patterns were simulated for GaAs in the zone axes (a) [[10\overline 9]] and (b) [109]. The three-beam conditions of interest are circled. An enlarged view of reflections g and h (yellow boxed region) is also shown. Note that [{\phi _1} = {\varphi _{\overline {9}, \overline 1,\overline 1}}] [ +\, {\varphi _{0,2,0}} - {\varphi _{\overline {9}, 1,\overline 1}} = 90^\circ] and [{\phi _2} = {\varphi _{9,\overline 1,\overline 1}} + {\varphi _{0,2,0}} - {\varphi _{9,1,\overline 1}}] = −90°.

IUCrJ
Volume 5| Part 6| November 2018| Pages 753-764
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518012216