Electron spin exchange in micellized radical pairs. I. 13C low field chemically induced dynamic nuclear polarization (CIDNP) and 13C radio frequency stimulated nuclear polarization (SNP)

Abstract

Electron spin exchange (ESE) in micellized radical pairs (RPs) has been considered. It is shown that the ST_ mechanism and ESE-induced paramagnetic relaxation provide observable low-field CIDNP, high-field SNP and CIDEP spectra. The best simulation of the spectra for 13C-labelled RPs was achieved for the following ESE potential parameters: an exchange constant in the RP at the recombination radius of about −7 × 10 9 rad s −1 and a parameter λ of the exchange potential decrease of about 0.5 Å.