COMMENT ON A SHAPE OF EPR-SPECTRA OF SPIN-CORRELATED RADICAL PAIRS AND SEPARATE RADICALS ESCAPED GEMINATE RECOMBINATION

For model spin-correlated radical pairs (RPs) the EPR spectra are simu lated and their shape is analyzed in detail. It is demonstrated that t he widths and intensities of the EPR spectra are determined essentiall y by the rate of the singlet-triplet dephasing and the scale of the sp in-spin interactions. It is also shown that chemical exchange of the R Ps between states with different values of the exchange and the dipole -dipole interactions can produce the apparent antiphase structure line s in the EPR spectra.