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J Magn Reson. 2008 Aug;193(2):177-90. doi: 10.1016/j.jmr.2008.04.030. Epub 2008 Apr 24.

Long-lived states in solution NMR: theoretical examples in three- and four-spin systems.

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Department of Radiology, Beth Israel Deaconess Medical Center, and Harvard Medical School, Ansin Building, Room 222, 330 Brookline Avenue, Boston, MA 02215, USA.


Long-lived spin states have been observed in a variety of systems. Although the dynamics underlying the long lifetimes of these states are well understood in the case of two-spin systems, the corresponding dynamics in systems containing more spins appear to be more complex. Recently it has been shown that a selection rule for transitions mediated by intramolecular dipolar relaxation may play a role in determining the lifetimes of long-lived states in systems containing arbitrary numbers of spins. Here we present a theory of long-lived states in systems containing three and four spins and demonstrate how it can be used to identify states that have little or no intramolecular dipolar relaxation.

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