ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
A general problem of the computer simulation of X-ray traverse topographs is treated on the basis of the Green-function method. Special attention is paid to the role of partial coherence of the incident radiation and to the problem of accounting for it in the practical calculations. The reciprocity theorem for the Green functions is proved rigorously in the X-ray diffraction optics and is applied to solve the problem in question. Different approaches based on the solution of the boundary problem of the Cauchy type and on the Green-function method are analysed and are compared from the view point of the computation time needed and of their adaptation capability to real experimental conditions. It is shown that, in the present case of a small correlation length in the primary beam, the Green function method has very significant advantages, which make it the only one acceptable for practical computer simulations. As examples, the diffracted intensity profiles of some dislocation images are computed with this method. These profiles demonstrate good correspondence with the experimental ones as well as the possibility of the determination of the Burgers vector sign from the pairs of profiles measured with opposite directions of the diffraction vector.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739480000563
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