A single-crystal 181Ta-NMR experiment was performed in KTaO3 in an unsuccessful attempt to observe the splitting pattern characteristic of electric hexadecapole coupling. A linewidth of about 12 kHz was observed, and assigned to residual first-order quadrupole couplings arising from imperfections in this nominally cubic crystal. Experimental difficulties prevented the removal of the electric quadrupole (and magnetic dipole–dipole) couplings by multiple-pulse linenarrowing methods.
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Doering et al. (1986) studied this question.
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