"Variable-angle" sample-spinning nuclear magnetic resonance spectroscopic studies of non-integral spin quadrupolar nuclei in solids: Analysis of spinning-sidebands for the case η=0

We present an average Hamiltonian analysis of the "variable-angle" sample-spinning nuclear magnetic resonance spectra of the central ( 1 2, - 1 2) transition of the I= 3 2 nuclei ²³Na (in Na₂MoO₄) and ¹¹B (in a borosilicate glass) in the slow-spinning regime (ω_r < W ( 1 2, - 1 2), for a purely second-order quadrupolar interaction and an axially symmetric electric field gradient tensor. We obtain good agreement between theory and experiment. The technique is applicable to the analysis of systems with large quadrupole coupling constants, as well as to those with multiple sites and different coupling constants and chemical shifts.