Abstract

A general formulation of the theory of the secondary radiation yield by X-ray diffraction in a crystal is given which enables such processes as photoelectric effect, fluorescence and thermal diffuse scattering (TDS) to be described in a unified way. Expressions describing TDS by crystals are obtained with an account of their elastic properties. TDS specificity is analyzed in detail. It is shown that the TDS yield curves are determined not only by the scattering cross sections for the incident and diffracted waves, but also by the phase relations between the scattering amplitudes.

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