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

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, 155 (15), 1-9, [154201]. (doi:10.1063/5.0065863). (In Press)

Record type: Article

Abstract

Coupled pairs of nuclear spin-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 for 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.

Text

LD_CB_WEREWOLF-JCP-acc - Accepted Manuscript

Available under License University of Southampton Accepted Manuscript Licence.

Download (533kB)

More information

Accepted/In Press date: 8 September 2021

Additional Information: Funding Information: We acknowledge funding received from the Marie Skłodowska-Curie program of the European Union (Grant No. 766402), the European Research Council (Grant No. 786707-FunMagResBeacons), and EPSRC-UK (Grant Nos. EP/P009980/1, EP/P030491/1, and EP/V055593/1). We thank Soumya Singha Roy for discussions and Marcel Utz and Andrey Pravdivtsev for comments on the manuscript. We thank Weidong Gong for instrumental help and one of the referees for bringing stimulated nuclear polarization to our attention.4 The authors have no conflicts to disclose. Publisher Copyright: © 2021 Author(s).

Learn more about Institute for Life Sciences research