Dynamic view of the solid-state DNP effect

  • The first report of dynamic nuclear polarization (DNP) in liquids via the solid-effect mechanism [Erb, Motchane and Uebersfeld Compt. rend. 246, 2121 (1958)] drew attention to the similarity between the field profile of the enhancement and the dispersive component of the EPR line. The implications of this similarity, however, were not pursued subsequently as practically at the same time Abragam explained the effect in terms of state mixing by the dipolar interaction. Here we develop a description of the solid effect which is grounded in the dynamics of the electron-nucleus spin system, rather than the static view of state mixing. Our approach highlights the role of the coherences in the polarization transfer, and shows that the offset dependence of the DNP enhancement can be rationalized as the response of two band-pass filters connected in series. The first filter is the power-broadened EPR line; the second filter consists of two parts centered on both sides of the electronic resonance and displaced by one nuclear Larmor frequency from it. Being proportional to the product of the two filters, the DNP enhancement profile acquires its odd symmetry from the dispersive EPR line, as intuited by Erb et al. and in agreement with their phenomenological treatment. The developed time-domain description of the solid effect is extendable to liquids where the dipolar interaction changes randomly in time due to molecular diffusion.

Download full text files

Export metadata

Metadaten
Author:Deniz SezerORCiD
URN:urn:nbn:de:hebis:30:3-875452
DOI:https://doi.org/10.5194/mr-2023-1
ISSN:2699-0059
Parent Title (English):Magnetic resonance discussions
Publisher:Copernicus Publications
Place of publication:Göttingen
Document Type:Article
Language:English
Date of Publication (online):2023/03/06
Date of first Publication:2023/03/06
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/10/29
Volume:4
Page Number:34
First Page:1
Last Page:34
Note:
Funding: DFG ; 405972957
Note:
Gefördert durch den Open-Access-Publikationsfonds der Goethe-Universität.
Note:
Begutachteter Artikel erschienen in: Magnetic resonance, 4. 2023, Nr.1, S. 129–152, doi: 10.5194/mr-4-129-2023
Note:
The code used to generate the figures is at https://github.com/dzsezer/solidDNPliquids (https://doi.org/10.5281/zenodo.7990757, Sezer, 2023b).
Institutes:Biochemie, Chemie und Pharmazie
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Sammlungen:Universitätspublikationen
Open-Access-Publikationsfonds:Biochemie, Chemie und Pharmazie
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International