Manifestation of spin exchange relaxation in microwave field induced magnetic field effects on recombination of confined radical pairs

Within the simple exponential kinetic model, possible manifestations of the strong electron spin exchange interaction (ESEI) and relaxation (ESER) in microwave field induced magnetic field effects on recombination of confined radical pairs are analysed theoretically. It is shown that not only ESEI but also ESER strongly affects the spectra of reaction yield detected magnetic resonance, stimulated nuclear polarisation and EPR leading to broadening and change of line shape.