Abstract
Calculations within the slope of a two-site model have revealed that fast decay of a singlet radical pair (RP) could inhibit T→S transition of the RP. In this case, the splittings observed in ESR (RYDMR, SNP) spectra should be equal to half of the corresponding hfi constants even in the absence of exchange interaction. Calculations of SNP spectral for acyl-alkyl flexible biradicals have shown that the halved splitting as compared to the hfi constant, which is observed experimentally, can be explained with no exchange interaction considered. it is shown that in certain cases, the mean RP lifetime can increase with increasing singlet RP decay rate.
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