Abstract
Spin echo techniques have been used to study the diffusion of3He in liquid isotopic mixtures with molar concentrations in the range fromX 3=0.137toX 3=0.850 over a temperature range from ∼ 3.0 to ∼ 0.4 K. AboveT λ the diffusive behavior is very similar to that of pure3He, although there is an increased scattering associated with4He. BelowT λ the diffusion coefficient increases with decreasing temperature and shows a dependence on the3He number density much like that of a classical gas. The excitations of4He have little influence on the3He diffusion coefficient, even at temperatures well above 1 K.
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The Rhodes Trust and the National Research Council of Canada supported one of us (R.B.H.) during the course of this research.
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Harrison, R.B., Hatton, J. 3He diffusion in liquid isotopic mixtures. J Low Temp Phys 6, 43–50 (1972). https://doi.org/10.1007/BF00630908
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DOI: https://doi.org/10.1007/BF00630908