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The lowest-order term due to anharmonicity in the thermal diffuse scattering of X-rays by some cubic crystals has been investigated. This term can be regarded as an interference between harmonic one- phonon and two-phonon scattering. The resultant intensities have been evaluated along several lines in reciprocal space, including the three main symmetry axes, for a number of face centred cubic alkali halides and for aluminium. The calculations were based on an anharmonic interaction restricted to nearest neighbour short range terms for the alkali halides with next nearest neighbour interactions included for aluminium. Significant intensity changes are found for all materials investigated.
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Pirie et al. (1971) studied this question.
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