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Generalised magnetisation-to-singlet-order transfer in nuclear magnetic resonance

Generalised magnetisation-to-singlet-order transfer in nuclear magnetic resonance
Generalised magnetisation-to-singlet-order transfer in nuclear magnetic resonance
A variety of pulse sequences have been described for converting nuclear spin magnetisation into long-lived singlet order for nuclear spin-1/2 pairs. Existing sequences operate well in two extreme parameter regimes. The magnetisation-to-singlet (M2S) pulse sequence performs a robust conversion of nuclear spin magnetisation into singlet order in the near-equivalent limit, meaning that the difference in chemical shift frequencies of the two spins is much smaller than the spin–spin coupling. Other pulse sequences operate in the strong-inequivalence regime, where the shift difference is much larger than the spin–spin coupling. However both sets of pulse sequences fail in the intermediate regime, where the chemical shift difference and the spin–spin coupling are roughly equal in magnitude. We describe a generalised version of M2S, called gM2S, which achieves robust singlet order excitation for spin systems ranging from the near-equivalence limit well into the intermediate regime. This closes an important gap left by existing pulse sequences. The efficiency of the gM2S sequence is demonstrated numerically and experimentally for near-equivalent and intermediate-regime cases.
1463-9076
9703-9712
Bengs, Christian
cd3282d0-27ad-444f-bcb4-70eeab0029b9
Sabba, Mohamed
86002c7a-3fb8-4629-a13b-fbd6737b3c46
Jerschow, Alexej
4809ea26-1ad9-4f59-a7e4-e66ea2ed6692
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Bengs, Christian
cd3282d0-27ad-444f-bcb4-70eeab0029b9
Sabba, Mohamed
86002c7a-3fb8-4629-a13b-fbd6737b3c46
Jerschow, Alexej
4809ea26-1ad9-4f59-a7e4-e66ea2ed6692
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3

Bengs, Christian, Sabba, Mohamed, Jerschow, Alexej and Levitt, Malcolm H. (2020) Generalised magnetisation-to-singlet-order transfer in nuclear magnetic resonance. Physical Chemistry Chemical Physics, 22 (17), 9703-9712. (doi:10.1039/D0CP00935K).

Record type: Article

Abstract

A variety of pulse sequences have been described for converting nuclear spin magnetisation into long-lived singlet order for nuclear spin-1/2 pairs. Existing sequences operate well in two extreme parameter regimes. The magnetisation-to-singlet (M2S) pulse sequence performs a robust conversion of nuclear spin magnetisation into singlet order in the near-equivalent limit, meaning that the difference in chemical shift frequencies of the two spins is much smaller than the spin–spin coupling. Other pulse sequences operate in the strong-inequivalence regime, where the shift difference is much larger than the spin–spin coupling. However both sets of pulse sequences fail in the intermediate regime, where the chemical shift difference and the spin–spin coupling are roughly equal in magnitude. We describe a generalised version of M2S, called gM2S, which achieves robust singlet order excitation for spin systems ranging from the near-equivalence limit well into the intermediate regime. This closes an important gap left by existing pulse sequences. The efficiency of the gM2S sequence is demonstrated numerically and experimentally for near-equivalent and intermediate-regime cases.

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Accepted/In Press date: 18 March 2020
e-pub ahead of print date: 24 April 2020
Published date: 7 May 2020

Identifiers

Local EPrints ID: 440704
URI: http://eprints.soton.ac.uk/id/eprint/440704
ISSN: 1463-9076
PURE UUID: 59d2cf4a-31cd-4a5f-8d4c-70f0f9ca5850
ORCID for Christian Bengs: ORCID iD orcid.org/0000-0002-0196-7817
ORCID for Malcolm H. Levitt: ORCID iD orcid.org/0000-0001-9878-1180

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Date deposited: 13 May 2020 17:06
Last modified: 06 Jun 2024 01:39

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Contributors

Author: Christian Bengs ORCID iD
Author: Mohamed Sabba
Author: Alexej Jerschow

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