Isotopic thermal diffusion of carbon disulfide in the liquid phase

Thermal diffusion factors were measured for several isotopically substituted pairs of carbon disulfide molecules. The effect of a unit mass increment at the carbon position in the molecule was found to be substantially less than the effect of a unit mass substitution at one of the sulfur positions. The results were represented within experimental accuracy by α/sub T//sub i//sub j/ = 2.20 (m/sub i/-m/sub j/)/(m/sub i/+m/sub j/ ) +1.67(I/sub i/-I/sub j/)/ (I/sub i/+I/sub j/), where α/sub T//sub i//sub j/ is the isotopic thermal diffusion factor, m/sub i/ and m/sub j/ are the molecular masses, and I/sub i/ and I/sub j/ are the second moments