The influence of the singlet radical-pair decay rate on RYDMR and SNP spectra, and the mean RP lifetime

✍ Scribed by I.V. Koptyug; N.N. Lukzen; E.G. Bagryanskaya; A.B. Doctorov

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 471 KB
• Volume: 175
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)85565-t

✦ Synopsis

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 spectra 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 smglet RP decay rate.