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As a result of improvements in the method of analysis of gas mixtures, which permit detection of changes in mole fraction of 1 part in 105, a redetermination of the thermal diffusion factor for some gas mixtures of special interest in progress. Results are given here for argon-neon and krypton-argon mixtures. The intermolecular potential functions commonly used in connection with other transport properties of gases fail to account for the observed variation of the thermal diffusion factor at temperatures approaching the condensation point of one of the components, and this is attributed to dimerization.
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Grew et al. (1971) studied this question.
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