Cross-polarization from quadrupolar nuclei to silicon using low-radio-frequency amplitudes during magic-angle spinning
- Lawrence Berkeley National Lab., CA (United States)
- Stanford Univ., CA (United States)
The dynamics of cross-polarization from the central transition of a quadrupolar nucleus ({sup 27}Al or {sup 23}Na) to a spin-1/2 nucleus ({sup 29}Si) 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 {sup 29}Si NMR sensitivity and several applications are demonstrated. 50 refs., 8 figs., 4 tabs.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 501945
- Journal Information:
- Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Vol. 101, Issue 16; Other Information: PBD: 17 Apr 1997
- Country of Publication:
- United States
- Language:
- English
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