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Fine structure of weak kinematical diffraction beams emerging from wedge‐shaped crystals
Author(s) -
de Ridder R.,
van Landuyt J.,
Gevers R.,
Amelinckx S.
Publication year - 1970
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19700420218
Subject(s) - wedge (geometry) , diffraction , beam (structure) , fourier transform , optics , materials science , geometry , physics , mathematics , quantum mechanics
The fine structure of a weak kinematical diffraction beam, due to the presence of a wedge shaped crystal part in the selected area, is derived by applying a Fourier transformation to the expression of the wave function deduced within the two‐beam kinematical theory. Also the correspondence between the fine structure of a weak beam and the dark field image, produced by this beam, is analysed. Two general types of wedges are considered: wedges formed by grain or twin boundaries and general genuine wedges bound by vacuum. The theoretical results for the fine structure caused by the two types of wedges are compared with experiments on twin boundaries in stainless steel and on MgO crystals. The observations are in very good agreement with the theory.