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Sensitivity enhancement and low-field spin relaxation in singlet NMR

Sensitivity enhancement and low-field spin relaxation in singlet NMR
Sensitivity enhancement and low-field spin relaxation in singlet NMR
The singlet states of nuclear spin-1/2 pairs often display extended lifetimes that can be an order of magnitude longer than conventional relaxation times. We show that, in favourable circumstances, acquisition of the NMR signal during an extended multiple spin-echo train, followed by suitable data processing, enhances the signal-to-noise ratio of singlet NMR by up to an order of magnitude. The achievable enhancement depends on the transverse relaxation time constant, the magnetic field inhomogeneity, and the acceptable degradation in digital spectral resolution. We use the combination of singlet NMR and multiple spin-echo data acquisition to study the low-field nuclear relaxation processes of N-15-labelled nitrous oxide ((N2O)-N-15) in solution. A general relaxation theory for coupled 2-spin-1/2 systems in low magnetic field is developed. Experimental trajectories of the nuclear spin observables are compared with theoretical expressions, including dipole-dipole and spin-rotation relaxation mechanisms. The estimated values of the spin-rotation tensors are compared with previous estimations from NMR and molecular beam electric resonance.
1463-9076
16032-16040
Bocan, Jiri
28c26baa-5b93-462a-b663-41b3a8968e5f
Pileio, Giuseppe
13f78e66-0707-4438-b9c9-6dbd3eb7d4e8
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Bocan, Jiri
28c26baa-5b93-462a-b663-41b3a8968e5f
Pileio, Giuseppe
13f78e66-0707-4438-b9c9-6dbd3eb7d4e8
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3

Bocan, Jiri, Pileio, Giuseppe and Levitt, Malcolm H. (2012) Sensitivity enhancement and low-field spin relaxation in singlet NMR. Physical Chemistry Chemical Physics, 14 (46), 16032-16040. (doi:10.1039/c2cp42553j). (PMID:23099351)

Record type: Article

Abstract

The singlet states of nuclear spin-1/2 pairs often display extended lifetimes that can be an order of magnitude longer than conventional relaxation times. We show that, in favourable circumstances, acquisition of the NMR signal during an extended multiple spin-echo train, followed by suitable data processing, enhances the signal-to-noise ratio of singlet NMR by up to an order of magnitude. The achievable enhancement depends on the transverse relaxation time constant, the magnetic field inhomogeneity, and the acceptable degradation in digital spectral resolution. We use the combination of singlet NMR and multiple spin-echo data acquisition to study the low-field nuclear relaxation processes of N-15-labelled nitrous oxide ((N2O)-N-15) in solution. A general relaxation theory for coupled 2-spin-1/2 systems in low magnetic field is developed. Experimental trajectories of the nuclear spin observables are compared with theoretical expressions, including dipole-dipole and spin-rotation relaxation mechanisms. The estimated values of the spin-rotation tensors are compared with previous estimations from NMR and molecular beam electric resonance.

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More information

Published date: December 2012
Organisations: Magnetic Resonance

Identifiers

Local EPrints ID: 347842
URI: https://eprints.soton.ac.uk/id/eprint/347842
ISSN: 1463-9076
PURE UUID: 0db9576f-7815-42f2-9d4d-4d19481e86f0
ORCID for Giuseppe Pileio: ORCID iD orcid.org/0000-0001-9223-3896
ORCID for Malcolm H. Levitt: ORCID iD orcid.org/0000-0001-9878-1180

Catalogue record

Date deposited: 01 Feb 2013 09:14
Last modified: 20 Jul 2019 01:06

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