Cross Polarization From Quadrupolar Nuclei to Silicon Using Low Radio-Frequency Amplitudes During Magic-Angle Spinning
The dynamics of cross-polarization from the central transition of a quadrupolar nucleus (27Al or 23Na) to a spin-1/2 nucleus (29Si) during magic-angle spinning and using low-radio-frequency field 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 29Si NMR sensitivity and several applications are demonstrated.
Journal of Physical Chemistry
DOI of Published Version
DePaul, Susan M.; Ernst, Matthias; Shore, Jay S.; Stebbins, Jonathan F.; and Pines, Alexander, "Cross Polarization From Quadrupolar Nuclei to Silicon Using Low Radio-Frequency Amplitudes During Magic-Angle Spinning" (1997). Chemistry and Biochemistry Faculty Publications. 96.