Temperature dependence of energy and lifetime of rotons determined by Raman scattering

Abstract

Temperature dependence of the Raman spectrum of liquid 411e at a pressure of 5 kg/cm2 has been measured in the temperature region from 0.65 to 3.75 K. The temperature dependence has been found to be described by the one-component model with lorentzian temperature-broadening both above and below the lambda temperature T λ . From the analysis, temperature dependence of the minimum energy and the lifetime of rotons have been determined. The roton energy shows weak temperature dependence, and the lifetime deviates from the Landau-Khalatnikov theory above 1.80 K.