Abstract
Using the principles of group theory and approximation methods, a quantitative theory of distortion-induced infrared and Raman intensity due to forbidden modes of molecular units at non-polar site symmetries in crystals has been discussed. Among all forbidden modes only those which belong to , attain distortion induced activity (DIA) of first order where α ij/an is a component of anisotropic polarizability tensor; others attain higher order DIA and are hardly expected to be observed in I.R./Raman spectra due to their weak intensity.
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