Binary diffusion coefficients of helium/hydrogen isotope mixtures

Mass diffusion coefficients have been measured for the six binary mixtures formed from 3He and 4He with hydrogen, deuterium, and tritium. An intermolecular potential of the Hartree–Fock-dispersion form is presented which, when employed in the quantum mechanical theoretical evaluation of the diffusion coefficient, correlates experimental results for all six systems within the experimental uncertainty. No isotopic effect is displayed by the correlating potential.