Intensity of Raman lines in carbon tetrachloride

Abstract

POLLowiNG Silberstein's explanation of the optical anisotropy of molecules, Ramanathanl amongst others utilised the observed depolarization factors to calculate the interatomic distances in some typical cases. These results are not in agreement with the values obtained from band spectra. Havelock 2 on the other hand, assumed the known interatomic distances and calculated the polarizabilities of the constituent atoms. This subject has now acquired a fresh importance since such calculations may be extended t'o the determination of the intensity of Raman lines. It is well known that the intensity of a Raman line depends upon the variation of the induced optical moment of the molecule with respect to the corresponding normal co-ordinate. Since the polarizability of a molecule can be determined from the above calculations, its dependence on a particular normal co-ordinate and hence the intensity of the corresponding Raman line may also be evaluated. In the present investigation, this method has been applied to the special case of the total symmetric Raman line in CC1 4 . Some experimental results obtained by the author are compared with the theory.