The First-Order Raman Spectrum of Calcium Tungstate

The lattice-vibration Raman spectrum of calcium tungstate has been measured, using excitation by a He-Ne laser. Eleven of the thirteen long-wave-length phonon modes which are Raman active in first order have been detected. Polarization studies have revealed the group-theoretical symmetries of ten of the phonons. The linewidths and relative intensities of the Raman peaks have also been measured. These results complement the information obtained from the infra-red reflection spectrum of calcium tungstate. The frequencies of the infrared and Raman active phonons are discussed in terms of the normal modes of the lattice.

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