Low-power decoupling in fast magic-angle spinning NMR

We investigate the possibility of a low-power rf-irradiation approach to he teronuclear spin decoupling in solid-state NMR under high-frequency magic-a ngle sample spinning. Decoupling is achieved by applying an rf-field with a n amplitude corresponding to a precession frequency much lower than the spi nning frequency. This leads to a reversal of the averaging processes compar ed to normal high-power continuous-wave decoupling. Such an approach become s increasingly interesting with increasing MAS spinning frequency. In rigid solids, low-power decoupling becomes competitive above about 40 kHz MAS fr equency. (C) 2001 Elsevier Science B.V. All rights reserved.