Abstract
The effects of exchange and electron—electron dipolar interactions on electron spin echo envelope modulation and free induction decay in a photo-induced spin-correlated radical pair are examined. Analytical expressions are derived for FID and spin echo signals as a two-dimensional function of the time intervals between the laser pulse and the microwave pulses. It is predicted that these interactions can induce deep modulation or oscillation on the out-of-phase spin echo envelope whereas the in-phase echo vanishes. The modulation frequencies provide useful information for systems with small exchange and dipolar interactions even if the hyperfine inhomogeneity often produces unresolved spectra in cw EPR.
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