Thermal diffusion factors for the 4He–20Ne system at low temperatures

Thermal diffusion factors for the 4He–20Ne system have been measured in a low temperature region previously unexplored (down to 31 K) using a trennschaukel. Both quantum and classical transport collision integrals were evaluated for a recently proposed helium–neon intermolecular potential of the Hartree–Fock dispersion (HFD) type which has been shown to correlate cross section and transport property data quite well. The present data agree extremely well with the quantum mechanically calculated thermal diffusion factors. The classically calculated values fall considerably lower.