EXACT EVALUATION OF THE LINE-NARROWING EFFECT OF THE LEE-GOLDBURG PULSE SEQUENCE IN SOLID-STATE NMR-SPECTROSCOPY

Magic-angle irradiation or the Lee-Goldburg (LG) pulse sequence are ro utinely being used in high resolution NMR spectra of solids to suppres ses the homonuclear dipolar interaction while simultaneously scaling t he chemical shift and heteronuclear dipolar interactions. In this Lett er, a general and detailed spin dynamics calculation procedure to eval uate the performance of the LG sequence is presented which yields an e xpression for the dipolar scaling factor for an arbitrary rf strength, rf offset and windowed observation. This analysis is expected to be u seful in designing new multiple-pulse sequences for scaling the dipola r interaction. (C) 1998 Elsevier Science B.V.