The possibilities of the X-ray triple-crystal diffractometry (TCD) method in studying the tails of rocking curves of both a perfect crystal and a crystal with a disturbed surface layer are shown. It was found that at large deviation angles (α) from the Bragg condition the pseudopeak of the TCD curves significantly exceeds the main peak. The thermal diffuse scattering in the monochromator crystal is discussed as one of the reasons for this effect. This phenomenon is also responsible for the violation of the I(α) ∝ l/α2 dependence in double-crystal diffractometry (DCD). By measuring the intensities of the main peaks of TCD curves, it is possible to separate the diffuse and the coherent scattering components in the rocking curves obtained by DCD.
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Kazimirov et al. (1990) studied this question.