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The influence of anisotropic reorientation movements of molecules in molecular crystals on NQR spectral parameters (frequency v; quadrupole coupling constant e2qQ, asymmetry parameter of the electric field gradient η, spin–lattice (T1) and spin‐spin (T2) 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.
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Lotfullin et al. (1969) studied this question.
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