Stern, Quentin 
ORCID: https://orcid.org/0000-0002-8490-030X, Cousin, Samuel F., Mentink-Vigier, Frederic ORCID: https://orcid.org/0000-0002-3570-9787, Pinon, Arthur C., Elliott, Stuart J., Cala, Olivier ORCID: https://orcid.org/0000-0003-3579-0973 and Jannin, Sami ORCID: https://orcid.org/0000-0002-8877-4929
(2021)
Direct observation of hyperpolarization breaking through the spin diffusion barrier.
[Data Collection]
Description
Dynamic nuclear polarization (DNP) is a widely used tool for overcoming the low intrinsic sensitivity of nuclear magnetic resonance spectroscopy and imaging. Its practical applicability is typically bounded, however, by the so-called ‘spin diffusion barrier’, which relates to the poor efficiency of polarization transfer from highly polarized nuclei close to paramagnetic centers to bulk nuclei. A quantitative assessment of this barrier has been hindered so far by the lack of general methods for studying nuclear-polarization flow in the vicinity of paramagnetic centers. Here we fill this gap and introduce a general set of experiments based on microwave gating that are readily implemented. We demonstrate the versatility of our approach in experiments conducted between 1.2 – 4.2 K in static mode and at 100 K under magic angle spinning (MAS) — conditions typical for dissolution-DNP and MAS-DNP — and for the first time directly observe the dramatic dependence of polarization flow on temperature.
| Keywords: | Dryad,Chemical physics,nuclear magnetic resonance (NMR),Dynamic nuclear polarization (DNP),Spin diffusion,Spin diffusion barrier,Hyperpolarization resurgence (HypRes), |
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| Depositing User: | Data Catalogue Admin |
| Date Deposited: | 26 Jan 2023 17:29 |
| Last Modified: | 26 Jan 2023 19:03 |
| DOI: | 10.5061/dryad.fttdz08s3 |
| Original Record Link: | https://datadryad.org/stash/share/nF8nf0FPnTgNbps1pq-PTFhj8GddrC1ukW-in-gfkFo |
| URI: | https://datacat.liverpool.ac.uk/id/eprint/2052 |
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