nuclear polarization

nuclear polarization

[′nü·klē·ər ‚pō·lə·rə′zā·shən]
(nuclear physics)
For a nucleus in a mixed state, with spin I and probability p (Iz ) that the Iz substate is populated, the polarization is the sum over allowed values of Iz of Iz p (Iz )/ I.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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It covers mechanisms of spin relaxation, the formal theory of spin relaxation, spin resonance lineshape analysis, how to describe spin relaxation phenomena in more complex systems accounting for different kinds of spin interactions, application of the theory to electron spin resonance spectra of nitroxide radicals, nuclear spin relaxation in paramagnetic fluids, spin resonance beyond perturbation range, dipolar relaxation and quadrupolar interactions, the effects of mutual spin interactions, dynamic nuclear polarization, and anisotropic and internal dynamics.
Department of Energy's Ames Laboratory is now the home to a Dynamic Nuclear Polarization (DNP) solid-state Nuclear Magnetic Resonance (NMR) spectrometer that helps scientists understand how individual atoms are arranged in materials.
Another 27 studies consider such topics as fluctuations and relaxation dynamics of liquid water revealed by linear and nonlinear spectroscopy, charge transport at the metal-organic interface, ultrafast photochemistry in liquids, single-molecule fluorescence imaging in living cells, dynamic nuclear polarization methods in solids and solutions to explore membrane proteins and membrane systems, and molecular switches and motors on surfaces.
The epithelium may reveal a single outer layer of Ameloblastic cells of columnar to cuboidal shape which exhibit a tendency for palisading and reverse nuclear polarization; peripheral palisading and polarization are not always clearly evident.
The second section offers 12 chapters on recent developments, including high-frequency dynamic nuclear polarization, homonuclear and heteronuclear dipolar recoupling, and relaxation studies of solid biopolymers.
The researchers say that unlike normal MRI, hyperpolarization and a technique called "dynamic nuclear polarization" (DNP) can produce strong MRI signals from a variety of other kinds of atoms besides water.
Dynamic nuclear polarization (DNP) is a technique that increases the sensitivity of NMR experiments by increasing the polarization of the more rarely occurring nuclei in a given sample.
Its real part makes the neutron spin rotate around the direction of the nuclear polarization. Even if the neutron polarization aligns exactly along the x axis at the entrance of target, its z component arises during the neutron beam propagation.
Static techniques such as just keeping the target at low temperature (0.5 K) and high magnetic field (2.5 T), only achieve very modest nuclear polarization (less than 0.5%).
From the first come seven papers exploring conformational dynamics of oligosaccharides, structure and dynamics of carbohydrates using residual dipolar couplings, combined theoretical and NMR (nuclear magnetic resonance) experimental approach on carbohydrate-aromatic interactions and on pyranose ring distortion, laser photo chemically induced dynamic nuclear polarization technique as a tool for structural analysis of inter- and intramolecular protein-carbohydrate interactions, and hydroxy protons in structural studies of carbohydrates by NMR spectroscopy.