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Polarization Transfer via Field Sweeping in Parahydrogen-Enhanced Nuclear Magnetic Resonance

preprint
submitted on 03.04.2019 and posted on 04.04.2019 by James Eills, John W. Blanchard, Teng Wu, Christian Bengs, Julia Hollenbach, Dmitry Budker, Malcolm H. Levitt

We show that in a spin system of two magnetically inequivalent protons coupled to a heteronucleus such as 13C, an adiabatic magnetic field sweep, passing through zero field, transfers proton singlet order into magnetization of the coupled heteronucleus. This effect is potentially useful in parahydrogen-enhanced nuclear magnetic resonance, and is demonstrated on singlet-hyperpolarized [1-13C]maleic acid, which is prepared via the reaction between [1-13C]acetylene dicarboxylic acid and para-enriched hydrogen gas. The magnetic field sweeps are of microtesla amplitudes, and have durations on the order of seconds. We show a polarization enhancement by a factor of 104 in the 13C spectra of [1-13C]maleic acid in a 1.4 T magnetic field.

Funding

EP/N002482/1

EP/M508147/1

EP/P009980

766402

History

Email Address of Submitting Author

eills@uni-mainz.de

Institution

Johannes-Gutenberg University Mainz

Country

Germany

ORCID For Submitting Author

0000-0001-8468-6860

Declaration of Conflict of Interest

The authors declare no conflicts of interest.

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