A simple method of relating the scattered neutron energy distribution to the molecular frequency spectrum in hydrogenous solids is given. The method is approximate because of the neglect of translation-rotation couplings, but should be of practical interest for systems where translational and librational frequencies do not appreciably overlap. The approach is applied to cold-neutron-scattering data from hexagonal ice at 150°K. The resulting thermodynamic frequency distribution is used to compute moments, specific heat, and root-mean-square amplitude of vibrations. Comparison is made with optical, thermodynamic, x-ray, and neutron measurements.
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Prask et al. (1968) studied this question.
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