Abstract
The phonon side bands of the Raman forbidden bending and asymmetric stretching vibrations in crystalline carbon disulphide are discussed. The lattice dynamics has been treated using a model potential including anisotropic atom-atom interactions and electrostatic terms with point quadrupoles placed on the sulfur atoms. The Raman scattering cross sections has been calculated starting from a two-center representation of the molecular polarizability with two point polarizability tensors on the sulfur atoms. It has been found that the experimental Raman scattering can be satisfactorily explained as arising from non linear terms in the expansion of the crystal polarizability.
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