Abstract
AbstractSample spinning is successful in narrowing line widths of NMR spectra in both liquid and solid‐state NMR experiments due to a common underlying mechanism. Here, sample spinning is demonstrated to convert the effects on line width due to magnetic field inhomogeneity in the space domain into a periodic frequency variations in the time domain. The conditions needed to achieve this conversion differ significantly for liquids and solids by spinning the sample along a different axis having a unique orientation with the direction of external magnetic field. This is in order to form an NMR signal with a periodic frequency modulation composed of a distinct center band and side bands. The reason for this will be explained in detail in the text. Commonly, encountered experimental results can be clearly understood when described in terms of frequency modulation including the origin of spinning side‐bands in liquids and solids, and why one needs to spin the solid state sample faster for narrowing line widths of NMR spectra caused by magnetic dipole–dipole interaction when compared with chemical shift anisotropy. © 2009 Wiley Periodicals, Inc. Concepts Magn Reson Part A 34A: 249–263, 2009.
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