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. Author manuscript; available in PMC: 2023 Apr 28.
Published in final edited form as: J Phys Chem A. 2022 Apr 13;126(16):2600–2608. doi: 10.1021/acs.jpca.2c01559

Scheme 2:

Scheme 2:

Schematics of the proton CE MAS-DNP mechanism in the ideal case of a biradical with two non-overlapping EPR spectra separated by the proton Larmor frequency. (A) Conventional MAS-DNP where the spins of electron b are saturated, while the spins of the electron a are at thermal equilibrium. The proposed optically pumped hyperpolarization method in which the polarization of electron spin a is increased while the electron b is at thermal equilibrium (B) or saturated by microwave irradiation (C).