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Absorption coefficients in the dynamical theory of electron diffraction for the non‐symmetrical Laue case
Author(s) -
Sheinin S. S.,
Kim H. S.
Publication year - 1981
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.2221070234
Subject(s) - diffraction , absorption (acoustics) , electron diffraction , optics , crystal (programming language) , beam (structure) , x ray crystallography , dynamical theory of diffraction , bloch wave , physics , diffraction topography , electron , condensed matter physics , diffraction grating , quantum mechanics , acousto optics , computer science , programming language
In previous investigations of diffraction contrast in the non‐symmetrical Laue case, the standard expressions for Bloch wave absorption coefficients, which are based on the assumption of symmetrical Laue diffraction conditions, are used. An expression for absorption coefficients which is specifically applicable to the non‐symmetrical Laue case is derived. For strong beam diffraction conditions it is shown that small errors result from the use of symmetrical Laue absorption coefficients in the non‐symmetrical Laue case. For weak beam diffraction conditions, on the other hand, considerable error can result. These errors increase with increasing crystal thickness and for increasing departure from symmetrical Laue diffraction conditions.