Articles | Volume 4, issue 2
https://doi.org/10.5194/mr-4-243-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/mr-4-243-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
01 Nov 2023
Research article |
| 01 Nov 2023
| 01 Nov 2023
The solid effect of dynamic nuclear polarization in liquids – accounting for g-tensor anisotropy at high magnetic fields
Institute of Physical and Theoretical Chemistry, Goethe University, 60438 Frankfurt am Main, Germany
Danhua Dai
Institute of Physical and Theoretical Chemistry, Goethe University, 60438 Frankfurt am Main, Germany
Thomas F. Prisner
Institute of Physical and Theoretical Chemistry, Goethe University, 60438 Frankfurt am Main, Germany
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Since its discovery 65 years ago, the solid-state dynamic nuclear polarization effect has been rationalized in terms of mixing of the Zeeman energy levels. Before becoming aware of this explanation, Erb, Motchane and Uebersfeld proposed a dynamical equation to make sense of their experiments. Here we provide a formal justification of their phenomenological equation. The result is a different way of thinking about the solid-state effect, with novel implications for the effect in liquids.
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Since its discovery 65 years ago, the solid-state dynamic nuclear polarization effect has been rationalized in terms of mixing of the Zeeman energy levels. Before becoming aware of this explanation, Erb, Motchane and Uebersfeld proposed a dynamical equation to make sense of their experiments. Here we provide a formal justification of their phenomenological equation. The result is a different way of thinking about the solid-state effect, with novel implications for the effect in liquids.
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We show that the field profile of the solid effect in liquids is rich in dynamical information, including about timescales of molecular diffusion. We develop a general theoretical framework for extracting this information through quantitative fits to the experimental data. Unusual peaks in the enhancement field profile, which resemble thermal mixing but are not related to it, are demonstrated to arise in liquids under some conditions. These additionally restrict the dynamical parameters.
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Short summary
We recently liberated the solid effect of dynamic nuclear polarization (DNP) from its perturbative treatment by describing the relevant spin dynamics in a time domain. This allows us to easily account for dynamical processes that modulate the spin interactions in liquids, like the translational diffusion of spins. Here we additionally model the slow rotational diffusion of the polarizing agent and analyze DNP data from nitroxide spin labels in lipid bilayers at 9.4 T.
We recently liberated the solid effect of dynamic nuclear polarization (DNP) from its...
