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High-field high-speed MAS resolution enhancement in 1H NMR spectroscopy of solids |
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| Authors: | Samoson A Tuherm T Gan Z |
| Affiliation: | a National Institute of Chemical and Biophysics, Tallinn, 12618, Estonia b National High Magnetic Field Laboratory, Tallahassee, Florida, 32310 |
| Abstract: | Resolution in 1H NMR spectra of solids can be significantly enhanced with fast magic-angle spinning and high magnetic fields. A variable field and spinning speed study up to 25 T and 40 kHz shows that the homogeneous line broadening is inversely proportional to the product of magnetic field strength and spinning speed. The combination of high field and fast speed yields a 1H linewidth approaching the intrinsic limit determined by anisotropy of magnetic susceptibility. An analysis of the anisotropic magnetic susceptibility line broadening is presented. |
| Keywords: | NMR high field MAS, dipolar interaction line broadening, magnetic susceptibility |
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