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Solid State Nucl Magn Reson. 2009 Jun;35(3):152-63. doi: 10.1016/j.ssnmr.2009.01.002. Epub 2009 Jan 20.

Field cycling methods as a tool for dynamics investigations in solid state systems: recent theoretical progress.

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Institute of Physics, Jagiellonian University, Krakow, Poland.


In this paper physical mechanisms and theoretical treatments of polarization transfer and field-dependent relaxation in solid state systems, containing mutually coupled spins of spin quantum numbers I=12 (spins 12) and S1 (quadrupolar spins), are presented. First, theoretical descriptions of these effects are given in detail for an illustrative, simple system. Next, it is shown how to generalize the theories to much more complex spin systems. The polarization transfer and relaxation effects are illustrated by several examples. Typical misunderstandings regarding their physical origins are clarified. This paper reviews recent theoretical descriptions of the polarization transfer and relaxation phenomena. Its goal is to popularize the proper theoretical treatments with the intention to establish them as standard tools for analyzing field cycling data.

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