Spinning-frequency-dependent linewidths in 1H-decoupled 13C magic-angle spinning NMR spectra
โ Scribed by Toshihito Nakai; Charles A. McDowell
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 453 KB
- Volume
- 227
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
The broadenings observed in "C MAS NMR spectra, which depend on the sample-spinning speed, were studied, using polycrystalline adamantane. Not only was a monotonic increase of the linewidths with the increase of the spinning frequency observed, but also a novel resonant feature was found. The phenomena were interpreted as originating from rotary-resonance "C-'H recoupling.
๐ SIMILAR VOLUMES
Magic-angle spinning NMR spectra of samples containing dilute spin-1 2 pairs display broadenings or splittings when a rotational resonance condition is satisfied, meaning that a small integer multiple of the spinning frequency matches the difference in the two isotropic shift frequencies. We show ex
Complex spinning sidebands are observed in magic-angle-spinning (MAS) NMR spectra arising from isolated tightly J-coupled spin pairs under slow spinning conditions. Such spinning sidebands are sensitive to the magnitude and relative orientation of the chemical-shift tensors, the dipolar-coupling ten