Overhauser effect

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Overhauser effect

[′ō·vər‚hau̇z·ər i‚fekt]
(atomic physics)
The effect whereby, if a radio frequency field is applied to a substance in an external magnetic field, whose nuclei have spin ½ and which has unpaired electrons, at the electron spin resonance frequency, the resulting polarization of the nuclei is as great as if the nuclei had the much larger electron magnetic moment.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Williamson, The Nuclear Overhauser Effect in Structural and Conformational Analysis, VCH Publisher, New York, NY, USA, 1989.
The position of the methoxy group was confirmed by a nuclear Overhauser effect between methoxy protons and H-2', which was further supported by a [sup.13]C-[sup.1]H long-range COSY NMR experiment, in which we observed a correlation between C-3' and -OCH3 (Table 2).
Friebolin tracks the trends and makes sure students learn the basics as well in his chapters on the physical basis of NMR spectroscopy, the chemical shift, indirect spin-spin coupling, spectrum analysis and calculations, double resonance experiments, assignment of signals, relaxation, one- dimensional NMR experiments using complex pulse sequences, 2D NMR spectroscopy, the nuclear Overhauser effect, Dynamic NMR spectroscopy, shift reagents, macromolecules, and NMR spectroscopy in biology and medicine.

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