Theory of long-lived nuclear spin states in solution nuclear magnetic resonance. I. Singlet states in low magnetic field
Theory of long-lived nuclear spin states in solution nuclear magnetic resonance. I. Singlet states in low magnetic field
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 T1 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.
2-spin system, para-hydrogen, nmr, relaxation, polarization, parahydrogen, diffusion, alignment, protons, gypsum
Carravetta, Marina
d2c7f4a2-216d-487a-af55-2ec0bcccb62a
Levitt, Malcolm H.
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1 June 2005
Carravetta, Marina
d2c7f4a2-216d-487a-af55-2ec0bcccb62a
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Carravetta, Marina and Levitt, Malcolm H.
(2005)
Theory of long-lived nuclear spin states in solution nuclear magnetic resonance. I. Singlet states in low magnetic field.
Journal of Chemical Physics, 122 (21).
(doi:10.1063/1.1893983).
Abstract
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 T1 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.
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Published date: 1 June 2005
Additional Information:
Article number 214505
Keywords:
2-spin system, para-hydrogen, nmr, relaxation, polarization, parahydrogen, diffusion, alignment, protons, gypsum
Organisations:
Chemistry
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Local EPrints ID: 20754
URI: http://eprints.soton.ac.uk/id/eprint/20754
ISSN: 0021-9606
PURE UUID: 601cce13-5284-479e-99aa-17106c220948
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Date deposited: 02 Mar 2006
Last modified: 16 Mar 2024 03:18
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Author:
Marina Carravetta
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