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Figure 1
The new theory in terms of the Ewald sphere construction. All the reciprocal-lattice points coloured blue can form intensity at this incident angle at their respective 2θB values (e.g. green dots) if 0 < Ω < 2θB. The distance of the reciprocal-lattice point to the surface of the Ewald sphere along an arc in Ω defines its amplitude, which decreases as the distance increases. For example, [0{\bar 1}3] is in the Bragg condition and the amplitude is at its maximum value, whereas 002 is weaker and [0{\bar 2}3] is very weak etc. The arcs drawn for some of the reflections give a guide to the strength of the scattering. The Ewald sphere surface can be considered to have a thickness with a profile given by equation (4) of Fewster (2014BB6).

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ISSN: 2053-2733
Volume 74| Part 5| September 2018| Pages 457-465
https://doi.org/10.1107/S2053273318007489
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