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Study of Molecular Motions in 2‐Adamantanone by Nuclear Magnetic Resonance
Author(s) -
Decressain R.,
Amoureux J. P.,
Cochon E.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221900137
Subject(s) - condensed matter physics , relaxation (psychology) , superposition principle , dielectric , dipole , chemistry , phase (matter) , molecular physics , intermolecular force , nuclear magnetic resonance , intramolecular force , neutron scattering , neutron , physics , molecule , quantum mechanics , psychology , organic chemistry , stereochemistry , social psychology
The 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 T 1 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 T 1 is rather constant.