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Low-Frequency Excitation of Singlet-Triplet Transitions. Application to Nuclear Hyperpolarization

Low-Frequency Excitation of Singlet-Triplet Transitions. Application to Nuclear Hyperpolarization
Low-Frequency Excitation of Singlet-Triplet Transitions. Application to Nuclear Hyperpolarization
Coupled pairs of nuclear spins-1/2 support one singlet state and three triplet states. Transitions between the singlet state and one of the triplet states may be driven by an oscillating low-frequency magnetic field, in the presence of couplings to a third nuclear spin, and a weak bias magnetic field. The oscillating field is in the same direction as the bias field, and is called a WOLF (Weak Oscillating Low Field) pulse. Application of a WOLF pulse allows the generation of strong nuclear hyperpolarization of 13C nuclei, starting from the nuclear singlet polarization of a 1H spin pair, associated with the enriched para spin isomer of hydrogen gas. Hyperpolarization is demonstrated for two molecular systems.
0021-9606
1-9
Dagys, Laurynas
0de61597-b152-4bee-a934-123a9d2de883
Bengs, Christian
cd3282d0-27ad-444f-bcb4-70eeab0029b9
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Dagys, Laurynas
0de61597-b152-4bee-a934-123a9d2de883
Bengs, Christian
cd3282d0-27ad-444f-bcb4-70eeab0029b9
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3

Dagys, Laurynas, Bengs, Christian and Levitt, Malcolm H. (2021) Low-Frequency Excitation of Singlet-Triplet Transitions. Application to Nuclear Hyperpolarization. The Journal of Chemical Physics, 1-9. (doi:10.1063/5.0065863). (In Press)

Record type: Article

Abstract

Coupled pairs of nuclear spins-1/2 support one singlet state and three triplet states. Transitions between the singlet state and one of the triplet states may be driven by an oscillating low-frequency magnetic field, in the presence of couplings to a third nuclear spin, and a weak bias magnetic field. The oscillating field is in the same direction as the bias field, and is called a WOLF (Weak Oscillating Low Field) pulse. Application of a WOLF pulse allows the generation of strong nuclear hyperpolarization of 13C nuclei, starting from the nuclear singlet polarization of a 1H spin pair, associated with the enriched para spin isomer of hydrogen gas. Hyperpolarization is demonstrated for two molecular systems.

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LD_CB_WEREWOLF-JCP-acc - Accepted Manuscript
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Accepted/In Press date: 8 September 2021

Identifiers

Local EPrints ID: 451171
URI: http://eprints.soton.ac.uk/id/eprint/451171
ISSN: 0021-9606
PURE UUID: dbe89800-4df4-42f0-930e-82071d23ee31
ORCID for Malcolm H. Levitt: ORCID iD orcid.org/0000-0001-9878-1180

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Date deposited: 14 Sep 2021 15:31
Last modified: 15 Sep 2021 01:45

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Contributors

Author: Laurynas Dagys
Author: Christian Bengs

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