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10 - Other Methods of Nuclear Spin Polarization

Published online by Cambridge University Press:  03 February 2020

Tapio O. Niinikoski
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Summary

Methods other than DNP may also produce high nuclear spin polarization, either in thermal equilibrium with the solid lattice, or in dynamic equilibrium in a rotating frame. Optical pumping methods create a very high enhancement of the nuclear spin polarization based on spin exchange collisions with atoms whose outer electron is polarized by circular polarized light. Some methods are also based on creating high non-equilibrium polarization that is then frozen in by increasing the spin–lattice relaxation time. Chemical and biomedical research teams use the term “hyperpolarization” to describe the general methods of spin polarization enhancement beyond thermal equilibrium; DNP methods belong clearly to these. Other methods include optical pumping and chemical polarization methods such as Chemical Induced Dynamic Nuclear Polarization (CIDNP) and Parahydrogen Induced Polarization (PHIP).

Keywords

brute force polarizationspin refrigeratorchemical spin polarizationatomic hydrogenCIDNPPHIPOverhauser effectNOVELspin selected atomic beamsoptical pumping.
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The Physics of Polarized Targets , pp. 421 - 435
Publisher: Cambridge University Press
Print publication year: 2020

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