Frequency-Swept Integrated Solid Effect
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nihms888542.pdf
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Author(s)
Walish, Joseph J.
Can, Thach V
Walish, Joseph John
Swager, Timothy M
Griffin, Robert Guy
Date Issued
June 2017
Journal
Angewandte Chemie International Edition
Publisher
Wiley-Blackwell
Citation
Can, Thach V. et al. “Frequency-Swept Integrated Solid Effect.” Angewandte Chemie International Edition 56, 24 (May 2017): 6744–6748 © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Version
Author's final manuscript
Abstract
The efficiency of continuous wave dynamic nuclear polarization (DNP) experiments decreases at the high magnetic fields used in contemporary high-resolution NMR applications. To recover the expected signal enhancements from DNP, we explored time domain experiments such as NOVEL which matches the electron Rabi frequency to the nuclear Larmor frequency to mediate polarization transfer. However, satisfying this matching condition at high frequencies is technically demanding. As an alternative we report here frequency-swept integrated solid effect (FS-ISE) experiments that allow low power sweeps of the exciting microwave frequencies to constructively integrate the negative and positive polarizations of the solid effect, thereby producing a polarization efficiency comparable to (±10 % difference) NOVEL. Finally, the microwave frequency modulation results in field profiles that exhibit new features that we coin the “stretched” solid effect.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1002/ANIE.201700032
