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Abstract
Experiments on diffuse X-ray scattering by potassium chloride, aluminium and silver single crystals have been performed over the temperature range 4-293K. It is observed that scattering from longitudinal modes at 293K is not as expected from known frequencies. The extra scattering can be interpreted as due to anharmonic processes. At lower temperatures, 4 and 77K, along all the symmetry axes, experimental and harmonic scatterings are practical. For all the studied crystals at any temperature, scattering from the transverse modes is predictable from harmonic theory.
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