Detection of the ±32, ±12 satellite spectrum of Na23 in β-alumina via double-resonance interferometry

A nuclear double-resonance interferometric technique is developed and applied to a spin-32 system. The 90°(ν1)-360°(ν2) pulse scheme which is applied to Na23 in β-alumina allows the indirect detection of the first-order quadrupolar-shifted spectrum (the 32→12 and -12→-32 transitions) through observation of the phase of the 1/2 → -1/2 central line. The broad satellites of the Na23 spectrum in single-crystal β-alumina thus mapped out have not been reported in numerous previous NMR studies of this material.