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JE_sweep_JCP.pdf (9.63 MB)

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

preprint
submitted on 03.04.2019, 17:07 and posted on 04.04.2019, 16:13 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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