Raman intensities, vibrational eigenvectors, electro‐optical parameters and force constants of SO42−, ClO4−, PO43, CO32− and NO3− anions in polycrystalline samples

Abstract

AbstractThe relative Raman intensities of the fundamental vibrational modes of the tetrahedral oxoanions SO42−, ClO4−, PO43 and of the plane trigonal oxoanions CO32− and NO3− have been measured from polycrystalline samples. Using the bond polarizability theory, the vibrational eigenvectors of F2(Td) and E' (D3h) species of these anions in different crystalline environments are derived from the above Raman intensity data. The results are consistent with those obtained through Wilson's GF method, although there exists a multiplicity of solutions. Relative values of SO, ClO, PO and NO bond polarizability parameters are reported. Comparison of these results with liquid state absolute values from the literature enables us to suggest a standard for measuring absolute Raman intensities in the solid phase.