Abstract
AbstractThe temperature dependence of proton and carbon spin‐lattice relaxation rates in 2‐adamantanone is measured. The present experiments are analyzed in terms of relaxation resulting from intramolecular reorientation modulation of the spin‐spin interaction. In the plastic phase the molecular reorientations involve a superposition of uniaxial rotation and tumbling reorientation of the dipolar axis. The calculation of the corresponding autocorrelation function is made by using a Frenkel model. The resulting expression for T1 leads to a determination of the plastic phase residence times in good agreement with values previously deduced from quasi‐elastic neutron scattering and dielectric relaxation. In the low‐temperature phase the motions are completely frozen and T1 is rather constant.
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