%0 Journal Article %J Journal of Physical Chemistry B %D 1997 %T Cross-polarization from quadrupolar nuclei to silicon using low-radio-frequency amplitudes during magic-angle spinning %A DePaul, S. M. %A Ernst, M. %A Shore, J. S. %A Stebbins, J. F. %A Pines, A. %K locking %X

The dynamics of cross-polarization from the central transition of a quadrupolar nucleus (Al-27 or Na-23) to a spin-1/2 nucleus (Si-29) during magic-angle spinning and using low-radio-frequency Geld strengths are analyzed for the mineral low albite. Under these conditions additional complications in the spin-lock behavior of the quadrupolar nucleus and in the cross-polarization process were found experimentally and are examined in detail. A step-by-step procedure for optimizing cross-polarization from the central transition of a quadrupolar nucleus to a spin-1/2 nucleus is described. Significant enhancement of Si-29 NMR sensitivity and several applications are demonstrated.

%B Journal of Physical Chemistry B %V 101 %P 3240-3249 %8 Apr 17 %@ 1089-5647 %G English %U ://WOS:A1997WU63000031 %N 16 %M WOS:A1997WU63000031 %! Cross-polarization from quadrupolar nuclei to silicon using low-radio-frequency amplitudes during magic-angle spinning %R Doi 10.1021/Jp9623711