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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 for this given incident angle at their respective 2θB [subject to the conditions contained in Fewster (2014BB13), i.e. 0 < Ω < 2θB]. The distance of the reciprocal-lattice point to the surface of the Ewald sphere along the arc in Ω defines its amplitude. The amplitude decreases as the distance increases, e.g. 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 judge the strength of the scattering by the distance along the arc from the Ewald sphere maximum value. We can consider the Ewald sphere surface to have a thickness with a profile given by Fewster [2014BB13, equation (4)].

ISSN: 2053-2733
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