Abstract
The narrowing of the NMR spectra of solids by rapid specimen rotation is described with examples, and the theory of the effect of rotation on the various anisotropic nuclear interactions is summarized. The removal of dipolar and other sources of broadening enables fine structure to be revealed. Examples of chemical-shift fine structure in solids are phosphorus sesquisulphide, zinc phosphide, and phosphorus pentachloride. Examples of electron-coupled spin multiplets obtained in solids are potassium hexafluoroarsenate, hexafluoroantimonate, and hexafluorophosphate, which exhibit a quartet, sextet and doublet respectively. Work is also reported on sodium chloride, poly-tetrafluoroethylene, apatite and copper. Consideration is given to the effect of macroscopic rotation on the spectrum of a solid that is already partially narrowed by molecular or ionic motion. Helium-driven gas turbines used for this work operate to 8 kHz and experimental turbines have achieved 12.5 kHz. Comparisons are made with other methods of coherent averaging, particularly the rotating field method and the multiple pulse methods.
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Andrew, E.R. (1970). Nuclear Magnetic Resonance in Rapidly Rotating Solids. In: Coogan, C.K., Ham, N.S., Stuart, S.N., Pilbrow, J.R., Wilson, G.V.H. (eds) Magnetic Resonance. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7373-9_8
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DOI: https://doi.org/10.1007/978-1-4615-7373-9_8
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