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- W1775254449 abstract "Given the typical interaction strength between the nuclear electric quadrupole moment and non-vanishing local, extranuclear field gradients, the electric quadrupole relaxation mechanism is usually dominant for all spin-one or greater nuclei.In general, various quadrupolar relaxation rates can be written in simple, closed form, and features associated with relaxation-induced polarization and coherence transfer are quenched. Such expressions are summarized in the first few sections of this article. Also discussed are consequences associated with the failure of the extreme narrowing approximation that results in multiexponential relaxation.The quadrupolar interaction is traceless and in the motionally narrowed regime, averages to zero. Thus, only line broadening and not line positions are affected. However, the Zeeman and quadrupolar interactions do not commute and second-order (and higher order) corrections may become important. Thus, a discussion of the dynamic frequency shift in quadrupolar spin systems is provided.Finally, it is recognized that efficiently relaxed quadrupolar nuclei influence scalar-coupled spin one-half nuclei. Features associated with this phenomenon are developed in the last section of this article.Keywords:nuclear spin relaxation;quadrupolar relaxation;adiabatic linewidth parameter;spectral density functions;multispin order;dynamic frequency shift" @default.
- W1775254449 created "2016-06-24" @default.
- W1775254449 creator A5023890104 @default.
- W1775254449 date "2007-03-15" @default.
- W1775254449 modified "2023-10-16" @default.
- W1775254449 title "Relaxation Theory for Quadrupolar Nuclei" @default.
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- W1775254449 doi "https://doi.org/10.1002/9780470034590.emrstm0464" @default.
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