Thermal diffusion factor for the 3He–4He system in the quantum region

摘要: The composition dependence of the thermal diffusion factor for 3He–4He mixtures was measured at nine temperatures ranging from 5.5 to 240°K in a seven‐tube trennschaukel. A pronounced upon helium‐3 content observed which increased with decreasing temperature and also linear 1/αT, accord theory. experimental data were compared theoretical factors calculated quantum mechanically using several different helium potentials. Both our results indicate rather weak αT rising slowly region investigated. This is sharp constrast van der Valk, who rapid rise 40°K down 14°K. On basis ``sensitive'' regions transport properties intermolecular potential, as reported by Hanley Klein, we prefer either Beck's or Morse‐VDD potentials on above 50°K. However, we...