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The Influence of Hindered Rotation of Molecules in Molecular Crystals on the Spectral Parameters of Nuclear Quadrupole Resonance
Author(s) -
Lotfullin R. Sh.,
Semin O. K.
Publication year - 1969
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.19690350110
Subject(s) - quadrupole , spins , electric field gradient , nuclear quadrupole resonance , asymmetry , anisotropy , coupling constant , nuclear magnetic resonance , condensed matter physics , physics , relaxation (psychology) , spin (aerodynamics) , rotation (mathematics) , molecular physics , atomic physics , optics , quantum mechanics , psychology , social psychology , geometry , mathematics , thermodynamics
The influence of anisotropic reorientation movements of molecules in molecular crystals on NQR spectral parameters (frequency v ; quadrupole coupling constant e 2 qQ , asymmetry parameter of the electric field gradient η, spin–lattice ( T 1 ) and spin‐spin ( T 2 ) relaxation times) has been considered theoretically by the spectral density method. The calculations were performed considering the different nuclear spins. It is necessary to differentiate between models with “rapid” and “slow” (compared to the experimental frequency) reorientations.