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Updated: May 4, 2026

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Darwin's approach to X-ray diffraction on lateral crystalline structures
Vasily I Punegov1, Sergey I Kolosov1, Konstantin M Pavlov2
1Komi Research Center, Ural Division, Russian Academy of Sciences, 167982, Syktyvkar, Russian Federation.
Abstract:
Darwin's dynamical theory of X-ray diffraction is extended to the case of lateral (i.e., having a finite length in the lateral direction) crystalline structures. This approach allows one to calculate rocking curves as well as reciprocal-space maps for lateral crystalline structures having a rectangular cross section. Numerical modelling is performed for these structures with different lateral sizes. It is shown that the kinematical approximation is valid for thick crystalline structures having a small length in the lateral direction.
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