Depolarization-density tuning in supracritical solutions of methane-carbon dioxide

Abstract

The Raman depolarization ratios (RDRs) for a 10mol% solution of methane in carbon dioxide and the v ₁ frequency shifts are reported under supracritical conditions. A striking difference was found between the earlier pure methane results and those reported here. The time correlation functions are interpreted to yield a picture of the methane interacting with the carbon dioxide even at lower densities. The mixture results are also discussed in terms of a theoretical RDR calculations and experiments on carbon tetrachloride. It is believed that the RDR against density (pressure) data reflect the interbody potential function and torques; the quantification has to date, not been achieved.