期刊
JOURNAL OF MAGNETIC RESONANCE
卷 194, 期 1, 页码 46-57出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2008.05.027
关键词
hyperpolarization; PHIP; ALTADENA; extended lifetime; low field; relaxation
Recent work has shown that singlet states in two-spin systems call possess lifetimes exceeding the T, relaxation time, provided that the system is kept under conditions that minimize the effects of the chemical shift Hamiltonian (for instance Under low magnetic field or RE irradiation). Similar observations have been made in hyperpolarized states of multi-spin systems prepared via parahydrogen-induced polarization (PHIP). However, lifetime prolongation mechanisms in multi-spin systems are still under investigation. Here we present experimental observations of a long-lived state in a three-spin system prepared by PHIP and stored at low field. The observed lifetime of the long-lived state is 144s, about twice as long as the longest T, measured in the system at high held. The results are analyzed using a recently proposed theory of lifetime prolongation in multi-spin systems in low field. It is shown that quantum mechanical selection rules governing intramolecular dipolar relaxation in low field account for the enhanced lifetime and spectral features of this state. (C) 2008 Elsevier Inc. All rights reserved.
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