Temperature Dependence of the Intensities of Raman Lines

Abstract

I HAVE undertaken the critical and exhaustive study of Placzek's polarizability theory of Raman scattering. My investigations have been carried out both with solids and liquids, and the following observations made : (1) The intensity of the Stokes lines decreases with the rise of temperature, while according to the theory there should be an increase. (2) The intensity of the anti-Stokes lines, in general, increases with the increase of temperature, but not to the extent that would be expected from Placzek's theory. (3) The intensities of the Stokes and the anti-Stokes lines tend to meet each other at some finite value, while from the theory we should expect the intensities of the Stokes and the anti-Stokes lines to become large at high temperatures and to tend to meet each other at infinite intensity. (4) The ratio of the intensities of the Stokes and anti-Stokes lines, at all temperatures, is in agreement with the result expected from Placzek's theory.