Radical-Induced Low-Field ¹H Relaxation in Solid Pyruvic Acid Doped with Trityl-OX063.

ABSTRACT: In dynamic nuclear polarization (DNP), radicals such as trityl provide a source for high nuclear spin polarization. Conversely, during the low-field transfer of hyperpolarized solids, the radicals' dipolar or Non-Zeeman reservoir may act as a powerful nuclear polarization sink. Here, we report the low-temperature proton spin relaxation in pyruvic acid doped with trityl, for fields from 5 mT to 2 T. We estimate the heat capacity of the radical Non-Zeeman reservoir experimentally and show that a recent formalism by Wenckebach yields a parameter-free, yet quantitative model for the entire field range.

SUBMITTER: Jurkutat M 

PROVIDER: S-EPMC9661535 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature