Approximations of the dynamical theory of diffraction contrast
- 1 May 1968
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 17 (149) , 1039-1063
- https://doi.org/10.1080/14786436808223182
Abstract
The approximations of diffraction contrast theory, in particular the two-beam approximation and the column approximation, are critically examined. Contrast calculations for dislocations, spherically symmetric coherency strains and magnetic domain walls are described. In most cases the effect of the column approximation is small. This is because θD, the half angle of divergence of the energy flow in the crystal is usually very much less than θB, the Bragg angle. The results are discussed in terms of a perturbation theory of scattering which may prove useful for the determination of the structure of small, unknown defects.Keywords
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