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Cross-polarization dynamic-angle spinning nuclear magnetic resonance of quadrupolar nuclei

1994; Taylor & Francis; Volume: 81; Issue: 5 Linguagem: Inglês

10.1080/00268979400100741

1362-3028

Jay H. Baltisberger, Sheryl Lee Gann, Philip J. Grandinetti, Alexander Pines,

NMR spectroscopy and applications

Abstract The use of variable-angle spinning (VAS) with cross-polarization (CP) for quadrupolar nuclei has been evaluated both experimentally and theoretically. It is known that under normal spinning speeds the best VAS angle for performing CP is 0° (parallel to the magnetic field). We show that, with the use of dynamic-angle spinning (DAS) probes, CP may be done at 0° and detection in a one-dimensional VAS experiment may be performed at any angle in a zero-polarized VAS (ZPVAS) experiment. Finally, the combination of CP with k = 5 DAS (where the sample is spun first at 0° followed by 63·43°) provides both the highest resolution and the greatest sensitivity under normal conditions.