EFFECTS OF SEQUENTIAL ELECTRON-TRANSFER ON ELECTRON-SPIN POLARIZED TRANSIENT EPR-SPECTRA AT HIGH FIELDS

Effects of sequential electron transfer on electron spin polarized tra nsient EPR spectra at high magnetic fields are investigated. Unlike th e ordinary correlated radical pair model which neglects the effects of an intermediate radical pair, the sequential transfer mechanism becom es increasingly important at higher fields because of stronger singlet -triplet mixing due to a difference in the Zeeman interactions between the donor and the acceptor. Even if the intermediary radical pair has a lifetime of about 300 ps and is not directly detectable by EPR, not iceable changes in the polarized spectrum (at 95 and 250 GHz) of the s ubsequent radical pair are demonstrated.