Abstract
Previously obtained data on the recoilless fractions in single crystals of sodium chloride have been reanalyzed in terms of the general formalism conforming to the crystal symmetry. The original data were obtained by using Rayleigh scattering of the M\"ossbauer radiation. It was found that above the quantum region and at a temperature high enough to neglect anisotropy of the ionic form factors there is some anisotropy of the thermal motion of the entirely quartic character. On the other hand, quadratic terms in the wave-vector transfer are completely quasiharmonic. A departure from the Gaussian thermal distribution is quite significant for both cations and anions. The anisotropy tends to diminish at high temperatures.
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