Molecular Diffusion Studies in Gases at High Temperature. III. Results and Interpretation of the He—A System

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Abstract
Experimental measurements of the binary diffusion coefficient of He—A obtained by the point‐source technique over the temperature interval 300–1100°K are presented. The data include the extremes of the concentration dependence for DHe ‐ A measured at 298°K. Interpretation is made in terms of a purely repulsive interaction between the atoms; the concentration dependence is included in the theoretical analysis. Comparison is made with the He—A interaction obtained from other sources. At the highest temperature, the measurements overlap the range of validity of diffusion coefficients predicted from the potential obtained by Amdur et al. from small‐angle scattering experiments. Good agreement is shown to exist between the two types of experiments, which further substantiates the validity of predicting high‐temperature transport properties from scattering potentials.