Column Calibration Factor to Study the Composition Dependence of the Thermal Diffusion Factors of Inert Gas Mixtures

The experimental thermal diffusion factors α T of He 4 -Ar 40 and Ne 20 -Xe 132 gas mixtures at different compositions of the lighter components and an isotopic natural mixture of Ne 20 -Ne 22 are estimated at the mean temperature \bar T =340 K by the column calibration factor method from the available values of ln q e ( q e being the equilibrium separation factor) for those mixtures at different pressures in atmosphere for each composition, measured by J. M. Saviron et al . in a thermal diffusion column with the column calibration factor F s =3.946, the value (at \bar T =340 K) derived from the formula F s =68.94796-0.3174514 \bar T +3.71383×10 -4 T 2 as obtained by S. Acharyya et al . It is shown that the experimental α T ′ s, thus estimated with the help of F s and ln q max , agree excellently with those due to the existing methods using molecular models as well as with those due to Slieher's model-independent method, so far as their magnitudes and the trends of their variation with the mole fraction o...