Pure quadrupole resonance spectra of perrhenates and periodates

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Abstract
Rhenium pure quadrupole resonances have been observed in sodium, ammonium and silver perrhenates and the frequencies of both transitions for both rhenium isotopes recorded at room temperature and at 77°K, except in the case of ammonium perrhenate, where no signal is observed below about 257°K. The pure iodine quadrupole resonances in sodium and potassium periodates have also been observed. The crystals all have the scheelite structure and some distortion of the anion from a regular tetrahedron is probable. Values of the point‐charge field‐gradient tensors have been computed where reliable x‐ray data are available. The structure of the ions and the nature of the bonding is discussed.

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