Proton Magnetic Resonance Study of Solid Hexamethylethane

Proton Magnetic Resonance Study of Molecular Motion in Solid Silver Sulfate Tetrammine, Ag2S04 • 4NHS

The spin lattice relaxation time T\ and the second moment of the proton magnetic resonance were studied on polycrystalline samples of Ag2S04 • 4NH3. The wideline NMR measurements show a rapid reorientation of the NH3 groups around their threefold axes in the temperature range 250 K ^ T ^ 380 K. Below T 250 K, the rotation of the NH3 starts freezing-in. From Ti measurements an activation energy ...

Proton Nuclear Magnetic Resonance Study of Water in Flocs

Polymer/surfactant adsorption can lead to colloidal stability or particle flocculation, both of which are of importance in many industrial processes. Floc structure is one of the most important features of particle flocculation and this involves flOC-size, density and strength.1~ Spectroscopic techniques to investigate floc structure have been mainly limited to small-angle neutron scattering (S...

Proton Nuclear Magnetic Resonance Spectroscopy

Proton magnetic resonance study of ferredoxin from Clostridium pasteurianum.

Magnetic susceptibilities of both reduced and oxidized ferredoxin from Clostridium pasteurianum were obtained in solution. Whereas the reduced form exhibits a Curie law behavior, the magnetic susceptibility of oxidized ferredoxin in fact increases with temperature and suggests extensive antiferromagnetic exchange coupling between the component iron atoms. Contact-shifted resonances are observed...

Brain Proton Magnetic Resonance Spectroscopy

Magnetic resonance (MR) spectroscopy is an analytical method used in chemistry that enables the identification and quantification of metabolites in samples. It differs from conventionalMR imaging in that spectra provide physiologic and chemical information instead of anatomy. MR spectroscopy and MR imaging have their origin in nuclear magnetic resonance (NMR). NMR was first described in 1946 si...