Measurement of Simple Liquid Mixtures

Equation (26) can directly be employed for the description of TDFRS experiments on simple liquid mixtures, which are characterized by a single diffusion time r. 

Obviously, there is a strong isotope effect, and the Soret coefficient is reduced in the case of (C6D6), which has exactly the same mass as the other component, the cyclohexane. The measurements were conducted at T=21°C, q = 8030 cm1, and the contrast factors are almost identical for both mixtures. The sign of ST is such that benzene migrates towards the warmer regions [52]. 

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