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Critical opalescence of the binary liquid mixture perfluorotributylamine and isopentane is investigated. By combining light scattering and x-ray scattering measurements, data over a broad range of values of s/λ[s=2 sin (Θ/2), λ is wavelength] are obtained. The second moment of the averaged intermolecular pair potential is determined. It is shown how deviations from straight line behavior in plots of reciprocal intensity versus (s/λ)2 are determined by the shape of the intermolecular pair potential curve.
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Debye et al. (1964) studied this question.
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