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A formula has been derived for the contribution of the dipolar broadening to the second moment of the resonance line in pure quadrupole resonance experiments.The following assumptions have been made: The nuclear spins undergoing the resonant transitions have spin 1 or 3/2. No restriction has been set on the spins of "nonresonant" nuclei contributing to the dipolar broadening. The electric field gradients at all nuclear sites have axial symmetry and common directions.A comparison is made with Van Vleck's formula for straight magnetic resonance.
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Abragam et al. (1953) studied this question.
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