Neutron and Raman study of the lattice dynamics of deuterated thiourea

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Abstract
The Raman-active modes of thiourea, SC(NH2)2, and deuterated thiourea, SC(ND2)2, have been studied as a function of temperature and comparison is made with previous work. Neutron scattering results, obtained from a single crystal of SC(ND2)2 using a triple-axis spectrometer, include dispersion curves for acoustic modes propagating along the a*, b* and c* directions together with parts of optic branches. The measurements have been made mainly in phase V, with some results in phase I. The elastic constants obtained from the acoustic mode dispersion curves are compared with values obtained by Brillouin scattering.