Abstract
Liquid sulphur has been known since the beginning of this century to show at a temperature T p = 160°C a liquid-liquid transition assumed to consist of the polymerization of S 8 rings into very long polymeric chains. A first neutron scattering study of the liquid local order enabled us to check this assumption at a microscopic level. Then, the vibrational density of states and local motions were studied by time-of-light (TOF) inelastic neutron scattering as a function of temperature, below and above T p. Both the decrease of the modes characteristic of S 8 rings and the evolution of the quasielastic scattering with temperature are consistent with the picture of a polymer transition at T p followed by a ring-chain equilibrium.
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