SINGLE-QUANTUM NMR SPINNING-SIDE-BAND PATTERNS FOR SPIN-3 2 SYSTEM/

The NMR response of an isolated spin-3/2 system with an axially symmet ric quadrupolar interaction under magic-angle sample spinning to an id eal radio-frequency pulse using irreducible tensor operators is evalua ted analytically. The excited single-quantum spin coherences are modul ated by the sample spinning. The effects of spinning frequency, quadru pole coupling constant and the orientation of quadrupolar interaction relative to rotor axis on the spinning-side-band patterns are simulate d. High-resolution single-quantum spinning-side-band pattern detected for Na-23 (I = 3/2) nuclei in sodium nitrate powder is compared with t he simulation based on the theory and the quadrupole coupling is estim ated.