A proton dynamic nuclear polarization (DNP) NMR signal enhancement (β) close to thermal equilibrium, β β«Ψβ¬ 0.89, has been obtained at high field (B 0 β«Ψβ¬ 5 T, epr β«Ψβ¬ 139.5 GHz) using 15 mM trityl radical in a 40:60 water/glycerol frozen solution at 11 K. The electron-nuclear polarization transfer i
Dynamic nuclear polarization in the nuclear rotating frame
β Scribed by Robert A Wind; Liyun Li; Herman Lock; Gary E Maciel
- Publisher
- Elsevier Science
- Year
- 1988
- Weight
- 440 KB
- Volume
- 79
- Category
- Article
- ISSN
- 0022-2364
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## Abstract This study describes quantitatively the effect of O~2~ on the dynamic nuclear polarization (DNP) of water protons. It is shown theoretically how DNP enhancement is altered by the paramagnetism of O~2~. The nonlinear effect of oxygen on the enhancement factor has been approximated by a f
We have measured the time evolution of the cross-polarization processes between the proton spins of a naphthalene host crystal and the photo-excited triplet electron spins of pentacene guest molecules in a pulsed DNP experiment. The observed oscillatory behaviour is explained as arising from dominan