Polarized Raman intensities of sodium formate crystal and its non-cylindrical electrooptical parameters

Abstract

Relative band intensities in the polarized Raman spectra of a sodium formate single crystal have been measured. Electrooptical parameters (EOPs) of formate anion are calculated based on the oriented gas model. The valence EOPs of the Co − 2 group are treated as non-cylindrical. To select the correct sign combinations of the components of the derived polarizability tensors, all the equilibrium EOPs and the valence EOPs of the CH bond are assumed to be cylindrical and the band intensities of polycrystalline sodium formate are compared with those of its deuterated derivative. The depolarization ratios observed for their aqueous solutions are also utilized. Two plausible sets of EOPs are obtained. The valence EOPs associated with the CO − 2 symmetric stretching and the bending mode show one order differences between the in- and the out-of-plane components.