Geodesic
Diffraction image of primary narrow $X$-ray beam in weakly deformed crystal
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2012), pp. 51-55

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Huygens–Fresnel principle for dynamical diffraction of $X$-rays in a crystal with weak deformation field of its space lattice is stated with a view to construction of the wave functions of diffracted beams in the crystal lattice at an arbitrary distance $r$ of the point source of primary radiation from the crystal. In particular, the well-known approximations of an incident spherical $(r = 0)$ and plane $(r\to\infty)$ waves result as the limiting cases of the problem under consideration. Some features of the interference absorption (the Borrmann effect) of $X$-ray wave packages in a crystal with weak field of lattice displacements were discussed.
Keywords: $X$-ray diffraction in crystals, $X$-ray scattering.
Mots-clés : anomalous absorption 
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     title = {Diffraction image of primary narrow $X$-ray beam in weakly deformed crystal},
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G. R. Grigоryan. Diffraction image of primary narrow $X$-ray beam in weakly deformed crystal. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2012), pp. 51-55. http://geodesic.mathdoc.fr/item/UZERU_2012_3_a8/