Abstract
Thermal diffuse scattering in high-energy electron diffraction is analysed using the Einstein model of lattice vibrations. An expression for the intensity distribution in the Kikuchi pattern is obtained which includes thickness-dependent terms (i.e. a dependent-Bloch-wave theory is used) and the effects of a general crystal structure. The corresponding two-beam limit is shown to consist of four distinct terms, two of which depend on the phase of the structure factor. One of these is found to be non-zero only for non-centrosymmetric crystals and for relatively thin crystals. It leads to an asymmetric Kikuchi band, even in a symmetrical scattering geometry. This asymmetry may be used to determine the polarity of non-centrosymmetric crystals.
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Schedule a callMore From: Acta Crystallographica Section A Foundations of Crystallography
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