Pileio, Giuseppe (2017) Nuclear singlet spin states. In, Lindon, John C., Tranter, George E. and Koppenaal, David W. (eds.) Encyclopedia of Spectroscopy and Spectrometry (Third Edition). Elsevier, pp. 456-462. (doi:10.1016/B978-0-12-409547-2.12103-1).
Abstract
Isolated pairs of spin-1/2 nuclei can be prepared in a singlet state configuration that is immune to intrapair dipole–dipole relaxation, often the main source for the longitudinal magnetization decay constant T1. Because of this property singlet states can hold polarization for much longer than T1. In given circumstances, singlet states may be partially immune to other relaxation mechanisms thus offering spectacularly slow decay times. This article presents the most relevant theory beyond these phenomena, the methodology introduced to prepare these states and the current and potential applications of singlet states.
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