Temperature Effect on Raman Intensity of Liquid Sample and Local Field Correction

The relative intensities of the 996 cm−1 line of liquid benzene and the 367 cm−1 line of liquid chloroform were observed at various temperatures with a high accuracy. The apparent intensity change due to the temperature was explained completely in terms of the local field effect, the density change, and the statistical distribution. The validity of Eckardt’s correction factor was strongly supported. In the case of liquid chloroform, an intensity change due to intermolecular interaction was observed after the elimination of the above three factors. The reliability of the relative intensity measurements of Raman lines was discussed.