Abstract
The thermal-diffusion—column-shape factors have been computed for a gas whose molecules interact as rigid spheres. These tabulations supersede the earlier results of Srivastava, which are based on incorrect theoretical expressions for the shape factors. The experimental data on helium and xenon are interpreted. Previous tabulations of shape factors according to the Lennard-Jones (12–6) and Maxwellian models are also considered. It is found that for both the gases the calculated values of separation factors are in better agreement with the experimental data for the inverse power model than the Lennard-Jones (12–6) potential; the improvement though small for helium is very pronounced for xenon.
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