Abstract
Abstract Inelastic neutron scattering measurements on C10D16 show the existence of underdamped collective librational modes with temperature-independent frequency widths. A preliminary dynamical model, with no adjustable parameters, shows that the observed widths are consistent with the existing quasi-static disorder. Direct measurements of the orientational pair correlation function by means of elastic neutron scattering agree with the prediction of a simple Ising model. Intensity measurements between room-temperature and the ordering temperature (T c = 208.6K) indicate that the orientational correlations develop very slowly as T → T c.
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