Raman measurements have been carried out on the soft mode of thiourea and the wave vector and temperature dependence of the soft mode frequency ( 0 s ) are observed. The longitudinal ( w~L ) and transverse (OJST) frequencies are used to derive a comparison between the dielectric constant obtained from the LST relation and that obtained from standard measurements of the capacitance.Nous avons btudie en diffusion Raman la frbquence 05 du mode mou du monocristal de thiouree en fonction de la temperature et du vecteur d'onde. Nous avons observe les frequences longitudinale OSL et transverse WST en fonction de la temperature. Nous avons compare la valeur de la constante diblectrique statique 8; obtenue 21 partir de la relation de LST et celle obtenue par mesure de capacite.
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