Towards high-resolution NMR of more nuclei in solids: Sample spinning with time-dependent spinner axis angle
✍ Scribed by A. Llor; J. Virlet
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 563 KB
- Volume
- 152
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
In solids. high-resolution
NMR spectra can he obtained by magic angle spinning techniques (MAS, CRAMPS, etc.). These methods arc unable to fully rcmovc the broadening due to strong quadrupolar interaction of half-integer spins and many other anisotropic interactions. Here are given the theoretical prmclples of a new class of NMR experiments (DAS, dynamic angle spinning) which can remove not only the first-order broadening but also the second-order (or higher-order) broadenings. The axis of the spinner is made time dependent, either by switching, or by continuous motion. The characteristics of these spinner motions are given. It is shown that averaging of higher-order contributions is possible.