Dipolar Broadening of the Quadrupole Resonance Line in Crystals NaClO<SUB>3</SUB>, NaBrO<SUB>3</SUB>

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A few formulae have been derived for the contribution of the dipolar broadening to the second moment of the resonance line in pure quadrupole resonance experiment for crystals in which the following conditions are satisfied:<BR>(1) All nuclear spins involved, both resonant and nonresonant, have spin 3/2.<BR>(2) The electric field gradient tensor at all nuclear sites have axial symmetry. For resonant nuclei the gradient of the electric field has the same magnitude but the symmetry axes of the electric field gradient at several nuclear sites in the unit cell have different directions.<BR>(3) As for the nonresonant unclei no restriction has been set the magnitude of the electric field gradient and its directions.<BR>A comparison is made with the line widths for NaClO3 and NaBrO3 observed by K\={o}i et al.

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