shielding constant, \(\sigma\)

https://doi.org/10.1351/goldbook.S05645
In NMR the difference between the external @M03686@ and the local @M03686@ at a resonating @N04256@ affected by the neighbouring electrons divided by the external flux density, \(\sigma =\frac{B_{0}\,-\,B}{B_{0}}\).
Source:
Green Book, 2nd ed., p. 25 [Terms] [Book]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
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Last revised: February 24, 2014