Laser induced Raman spectra of some tungstates and molybdates

Abstract

The Raman spectra of single crystals of CaWO₄, CaMoO₄, PbWO₄, and PbMoO₄ have been recorded using a He-Ne laser (<i>λ</i> = 6328 Å) and an Argon ion laser (<i>λ</i> = 4880 Å) as the exciting radiation sources. The polarization data have enabled us to classify unambiguously the observed fundamentals into the Raman active species of the point group C_4h to which these crystals belong. The comparison of the spectra of these crystals in the low frequency region has also enabled us to make a rough classification of the bands into the rotational and the translational lattice vibrations.