Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 122, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1893983
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We have recently demonstrated the existence of exceptionally long-lived nuclear spin states in solution-state nuclear magnetic resonance. The lifetime of nuclear spin singlet states in systems containing coupled pairs of spins-1/2 may exceed the conventional relaxation time constant T-1 by more than an order of magnitude. These long lifetimes may be observed if the long-lived singlet states are prevented from mixing with rapidly relaxing triplet states. In this paper we provide the detailed theory of an experiment which uses magnetic field cycling to observe slow singlet relaxation. An approximate expression is given for the magnetic field dependence of the singlet relaxation rate constant, using a model of intramolecular dipole-dipole couplings and fluctuating external random fields. (c) 2005 American Institute of Physics.
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