Estimation of the Mutual Diffusion Coefficient of Hydrogen Atoms and Molecules

Abstract

The mutual diffusion coefficient D₁₂ of hydrogen atoms and molecules has been calculated from experimental data on the viscosity of mixtures of hydrogen atoms and molecules. The needed viscosity of pure atomic hydrogen was calculated from accurate experimental and theoretical potential energy curves. The resulting values of the viscosity are about 15% smaller than those estimated previously by Amdur from the mixture data, and the values of D₁₂ about 30% greater than Amdur's estimate. Values of D₁₂ calculated directly from the atom‐molecule force law are in good agreement with those obtained from the mixture viscosity.