Abstract
Magic angle spinning and 14N irradiation have been employed to perturb the 14N spin bath, in a new spin-echo triple resonance solid-state NMR experiment. Spinning introduces a time dependence in the 14N quadrupolar interaction, permitting transitions between the three | I, m〉 states, two or four times per rotor cycle; this alters the evolution of a 14N-coupled 13C spin. The reduction in 13C echo intensity, on 14N irradiation during the echo period, is greater for shorter CN distances. Irradiation at a constant frequency is more effective than sweeping through the 14N resonance. 14N double-quantum spectra are obtained indirectly by irradiation of the double-quantum transition.
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