Polarisation studies of the Raman spectrum of α-glycine and the orientation of CH₂ groups

Abstract

The polarisation characteristics of the intense Raman lines of α-glycine have been investigated using unpolarised incident λ 2536.5 radiation. Six different orientations of the crystal with reference to the directions of incidence and observation have been used. From the observed depolarisation values, the classification of the Raman lines to the two different symmetry types A g and B g has been made. The orientation of the CH₂ groups in α -glycine, deduced from polarisation studies, is slightly different from that given by Marsh by X-ray analysis and a quantitative estimate of this deviation has been made.