Abstract
Molecular dynamics of meta-fluoroaniline (mFA) — the system which makes a simple glass forming liquid — was examined by 13C NMR and dielectric relaxation measurements. Spin–lattice relaxation times T1, nuclear Overhauser (NOE) factors of chemically non-equivalent carbons and dielectric relaxation in mFA were measured as a function of temperature. The analysis showed that the correlation function describing molecular dynamics in mFA could be well described in terms of an asymmetric distribution of correlation times predicted by the Davidson–Cole model. The overall correlation times of mFA, derived from the simultaneous fitting of our T1, NOE, and dielectric data (as well as of the dielectric data obtained by Roessler's group) to the Davidson–Cole model, follow the non-Arrhenius temperature type of the behaviour in accordance with the Vogel–Fulcher equation.
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