Abstract
A spin-lattice relaxation time T 1 of α, β, β-Trifluoroacrylonitrile (FAN) was measured in the temperature region of -85 to 0°C. In the T 1 -temperature diagram, T 1 changed discontinuously at -34°C where the liquid-liquid phase transition occurred. Pressure-volume relation had a break point which correspond to the phase transition. From analysis of relaxation mecchanism, the transition is mainly due to a rotational molecular motion. A temperature dependence of the correlation time was expressed as Arrhenius equation in both phases and activation energies were 7.4×10 -2 and 8.7×10 -2 eV in the high and low temperature phase, respectively.
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