Reference Entry

nuclear Overhauser effect

Edited by Richard Rennie and Jonathan Law

in A Dictionary of Chemistry

Seventh edition

Published in print January 2016 | ISBN: 9780198722823
Published online January 2016 | e-ISBN: 9780191789540
nuclear Overhauser effect

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An effect in *nuclear magnetic resonance (NMR) used to increase the intensities of resonance lines. The large population differences between the states given by the Boltzmann distribution gives rise to strong intensities of resonance lines. In the nuclear Overhauser effect, spin relaxation is used to transfer population difference from one type of nucleus to another type of nucleus so that the intensities of the resonance lines of the second type of nucleus are increased. An example of such an enhancement, which is widely used, is between protons and ...

Reference Entry.  140 words. 

Subjects: Chemistry

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