Dynamic disorder in stable and metastable thiophene. - II. Non Lorentzian nuclear relaxation and glass transition

C. Bessada , Alain H. Fuchs , J. Gallier , B. Rousseau

A study of the proton nuclear relaxation of crystalline thiophene has been undertaken. Our results demonstrate that, in both the stable and the metastable phase sequences, the in-plane molecular reorientation does not have a single correlation time. This non Lorentzian nuclear relaxation is discussed in terms of a distribution of correlation times and in terms of the mathematically equivalent model of unequal potential wells. We conclude that the observed relaxation feature is the dynamical fingerprint for glass-forming materials.

Mots clés: glass transition glasses; molecular reorientation; organic compounds; proton magnetic resonance; spin spin relaxation

Domaines: Articles anciens

C. Bessada, Alain H. Fuchs, J. Gallier, B. Rousseau. Dynamic disorder in stable and metastable thiophene. - II. Non Lorentzian nuclear relaxation and glass transition. Journal de Physique, 1989, 50 (8), pp.855-859. ⟨10.1051/jphys:01989005008085500⟩. ⟨jpa-00210964⟩