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 ?
[sup.1]H-[sup.1]H Nuclear Overhauser Effect Spectroscopy (NOESY) NMR Spectroscopy.
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.
Vos et al., "[sup.31]P MR spectroscopic imaging of the human prostate at 7 T: T1 relaxation times, Nuclear Overhauser Effect, and spectral characterization," Magnetic Resonance in Medicine, vol.
Furthermore, the nuclear Overhauser effect (NOE) cross-peaks between H-6 ([delta] 6.79) and both the anomeric proton ([delta] 5.29) and the methoxy group (8 3.88) were observed in the ROESY spectrum of M5-1 (Fig.
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.
Typical one-dimensional NMR spectra were acquired for each of the samples employing the first increment of NOESY (Nuclear Overhauser effect spectroscopy) pulse sequence (NOESYPR1D).
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.
Application of the nuclear Overhauser effect," Journal of the American Chemical Society, vol.
Shirmer, The Nuclear Overhauser Effect, Academic, New York, NY, USA, 1971.