Raman effect in rochelle salt crystals

Summary

In a careful study of the Raman spectrum of a single crystal of rochelle salt, 25 distinct Raman shifts are recorded along with 4 water bands, many of them being reported for the first time. These shifts are compared with those observed by the author in a saturated solution of the salt in water. The most interesting effect observed in the study is that the intensities of many of the Raman lines change markedly for varying orientations of the crystal axes with respect to the directions of incidence and observationeven when the incident light is unpolarised. Those lines which change in intensity conspicuously with orientation of the crystal are presumably to be classed as the symmetrical oscillations while those which do not show any change are similarly included under antisymmetric oscillations.