Date of Original Version
Phase transitions of the nematic liquid crystal p-methoxy-benzylidine, p−n butyl-aniline were studied by recording the low-frequency Raman spectrum. The intensity of the lattice Raman bands undergoes abrupt change at the crystalline-to-nematic phase transition temperature, with an indication of a hysteresis. The band totally disappears at the isotropic (liquid) phase.
W. J. Borer, S. S. Mitra, and C. W. Brown. (1971). "Crystal to Liquid-Crystal Transition Studied by Raman Scattering." Physical Review Letters, 27(7), 379. Available at: http://dx.doi.org/10.1103/PhysRevLett.27.379