Heat capacity measurements have been performed on solid CH3D over the range 0.15 < T < 4 K where a large Schottky anomaly occurs. The entropy change in the anomaly is estimated to be 1.80 ± 0.10R which is about 14% less than that corresponding to complete orientational ordering of the molecules and total conversion of nuclear spin symmetry species. Some time effects associated with thermal equilibration have also been studied.
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Jones et al. (1975) studied this question.