Abstract
The temperature dependence of the Rayleigh-Brillouin spectrum in the n-tetracosane melt has recently been interpreted in terms of an onset of a mesomorphic transition in the liquid state. The present paper reports the results of temperature dependent Rayleigh-Brillouin measurements on di(2-ethyl hexyl) sebacate (DOS), which is chemically similar to n-tetracosane. DOS has a lower melting point and thus a broader liquid range. It displays a temperature dependent behaviour similar to that of n-tetracosane. It is shown that the Rayleigh-Brillouin data of both systems can be described by the generalized hydrodynamic theory previously proposed by Lin and Wang. The temperature dependence of the Rayleigh-Brillouin spectra can be attributed to the relaxation of the longitudinal stress modulus. There is no need to postulate a phase transition.
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