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The comparison shows that the \u0394J mechanism can become less efficient relative to the SOB pathway when the charge-transfer detuning is favorable. Literature-based estimates of coupling strengths, energy detuning, Franck\u2013Condon factors, and excited-state lifetimes are used to identify the conditions under which each mechanism may become important. The results provide a new basis for interpreting radical-enhanced ISC in rigid chromophore\u2013radical systems and for assessing the relative roles of the underlying mechanisms.<\/jats:p>","DOI":"10.1063\/5.0343980","type":"journal-article","created":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T10:04:14Z","timestamp":1786356254000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Competing mechanisms of radical-enhanced intersystem crossing in rigid chromophore\u2013radical conjugates"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6470-5769","authenticated-orcid":false,"given":"Yuri E.","family":"Kandrashkin","sequence":"first","affiliation":[{"name":"Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS , Sibirsky Tract 10\/7, Kazan 420029,","place":["Russian Federation"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,8,10]]},"reference":[{"issue":"5","key":"2026081006040957700_c1","doi-asserted-by":"publisher","first-page":"980","DOI":"10.1002\/chem.201903444","article-title":"Excited-state dynamics of non-luminescent and luminescent \u03c0-radicals","volume":"26","year":"2020","journal-title":"Chem. - Eur. 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