Residual chemical shift anisotropy
Encyclopedia
Residual chemical shift anisotropy (RCSA) is the difference between the chemical shift
Chemical shift
In nuclear magnetic resonance spectroscopy, the chemical shift is the resonant frequency of a nucleus relative to a standard. Often the position and number of chemical shifts are diagnostic of the structure of a molecule...

 anisotropy (CSA) of aligned and non-aligned molecules. It is normally three orders of magnitide smaller than static CSA. RCSA is useful for structural determination and it is among the new developments in NMR spectroscopy
NMR spectroscopy
Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy, is a research technique that exploits the magnetic properties of certain atomic nuclei to determine physical and chemical properties of atoms or the molecules in which they are contained...

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