Anomalous Temperature Dependence of Proton Spin–Lattice Relaxation in Tribromoacetamide (TBAA)

Abstract

The temperature dependence of proton spin–lattice relaxation rate was measured in a molecular crystal, tribromoacetamide (TBAA). An anomalous narrow peak of the relaxation rate, which may be related to the critical phenomena accompanying phase transition, has been found in the vicinity of phase transition temperatures. Another peak has also been observed, which is an ordinary broad one characteristic of the relaxation caused by the fluctuation of the dipolar interaction.