Levitt, Malcolm H. (2020) Long-lived states in nuclear magnetic resonance: an overview. In, Pileio, Giuseppe (ed.) Long-lived Nuclear Spin Order: Theory and Applications. (New Developments in NMR, 22, 2020-January) 22 ed. Royal Society of Chemistry, pp. 3-32. (doi:10.1039/9781788019972-00001).
Abstract
An overview of long-lived states in nuclear magnetic resonance (NMR) is given. The chapter includes a sketch of the symmetry theory of long-lived states, which allows prediction of the number and nature of the long-lived states. The key elements of an NMR experiment involving long-lived states are reviewed. The concepts that are covered include: symmetry switching, disconnected eigenstates, disconnected state manifolds, singlet-triplet population imbalance, permutation groups and their irreducible representations, long-lived state operators, the symmetrical approximations to relevant spin Hamiltonians, magnetic equivalence and near-equivalence.
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