AN OPTICAL BRILLOUIN STUDY OF A RE-ENTRANT BINARY LIQUID MIXTURE

摘要

Optical spectroscopy studies on the system betapicoline-D_2O which forms a critical mixture showing a closed-loop phase diagram have been carried out along a large range of temperatures, comprising crossing of the two critical curves which define the closed loop of the coexistence curve. Data pertaining the elastic properties of the mixture either in one or two-phase states for the sound velocity and the sound absorption were obtained by means of analysis of the spectra of scattered radiation using Brillouin light scattering spectroscopy.