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.
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References in periodicals archive ?
Proton based Nuclear Overhauser Effect spectroscopy (NOESY) was performed to determine the molecular level interactions between the PEO and additives in dry films.
The nuclear Overhauser Effect spectroscopy (NOESY) was performed with the allylic alcohol obtained by the reduction of the corresponding ester.
In particular, the instrumentation comprises a fluxgate magnetometer FGE--Danish Meteorological Institute and a fluxgate vector magnetometer Geomag M390 as well as an Overhauser effect magnetometers GSM90.
Kitamura, "Intra- and intermolecular 1H-1H nuclear Overhauser effect studies on the interactions of chlorpromazine with lecithin vesicles," Journal of the American Chemical Society, vol.
Part IV touches upon methodology such as relaxation time analysis, the Nuclear Overhauser Effect, chemical exchange, 2D spectroscopy, solid-state NMR, and perturbation due to intermolecular interactions.
Proton COSY (correlation spectroscopy) ROESY (rotating frame Overhauser effect spectroscopy)1H-13C HSQC (heteronuclear single quantum coherence) and HMBC (heteronuclear multi-bond correlation) NMR (Nuclear Magnetic Resonance) experiments were recorded in d4-methanol on a Bruker DRX 600 spectrometer.
The position of the methoxy groups was confirmed by the observation of a nuclear Overhauser effect between methoxy protons and H-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.
The Conformation of NaAD Bound to NAD-Synthetase Determined by Transferred Nuclear Overhauser Effect Spectroscopy.