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Here, we introduce a unified theoretical framework that rigorously incorporates vibronic contributions through a phase-consistent Herzberg\u2013Teller expansion of the hyperfine Hamiltonian. Application to the FMNH\u2022\u2013Cys\u2022 radical pair shows that second-order vibronic coupling enhances hyperfine-mediated electronic transitions between spin states by up to 108\u2013109-fold. The S\u00b0 \u2192 T\u00b0 rate increases from \u223c5\u221240 s\u22121 (Franck\u2013Condon) to \u223c2\u00d7108\u22121\u00d7109 s\u22121 (Herzberg\u2013Teller), while the T\u00b0 \u2192 S\u00b0 rate increases from \u223c4\u00d7102\u22121\u00d7103 s\u22121 to \u223c7\u00d7108\u22122\u00d7109 s\u22121. This observed nanosecond timescale correlates well with the microsecond lifetime photoadduct formation central to its function. Comparison to spin\u2013orbit coupling places these rates within the broader landscape of spin-mixing mechanisms, indicating that the hyperfine interaction operates on chemically relevant timescales. This work underscores the importance of incorporating a vibronic description in hyperfine-driven dynamics and provides a generalized methodology that captures essential non-Condon effects even at the single-structure level, thus serving as a complementary tool for systems where full ensemble sampling is impractical or not yet integrated into standard workflows.<\/jats:p>","DOI":"10.1063\/5.0326602","type":"journal-article","created":{"date-parts":[[2026,5,8]],"date-time":"2026-05-08T11:46:51Z","timestamp":1778240811000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Vibronic contributions to hyperfine-mediated spin kinetics"],"prefix":"10.1063","volume":"164","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6184-275X","authenticated-orcid":false,"given":"Anjay","family":"Manian","sequence":"first","affiliation":[{"name":"School of Science and Molecular Horizons, University of Wollongong , Wollongong, NSW 2522, and , Wollongong, NSW 2522,","place":["Australia Australia"]},{"name":"ARC Centre of Excellence in Quantum Biotechnology, University of Wollongong , Wollongong, NSW 2522, and , Wollongong, NSW 2522,","place":["Australia Australia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0088-9677","authenticated-orcid":false,"given":"Holden James","family":"Paz","sequence":"additional","affiliation":[{"name":"School of Science and Molecular Horizons, University of Wollongong , Wollongong, NSW 2522, and , Wollongong, NSW 2522,","place":["Australia Australia"]},{"name":"ARC Centre of Excellence in Quantum Biotechnology, University of Wollongong , Wollongong, NSW 2522, and , Wollongong, NSW 2522,","place":["Australia Australia"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1099-2803","authenticated-orcid":false,"given":"Haibo","family":"Yu","sequence":"additional","affiliation":[{"name":"School of Science and Molecular Horizons, University of Wollongong , Wollongong, NSW 2522, and , Wollongong, NSW 2522,","place":["Australia Australia"]},{"name":"ARC Centre of Excellence in Quantum Biotechnology, University of Wollongong , Wollongong, NSW 2522, and , Wollongong, NSW 2522,","place":["Australia Australia"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2026,5,8]]},"reference":[{"key":"2026050807464940000_c1","first-page":"335","volume-title":"Atomic Many-Body Theory","year":"1982"},{"key":"2026050807464940000_c2","doi-asserted-by":"publisher","first-page":"034066","DOI":"10.1103\/physrevapplied.15.034066","volume":"15","year":"2021","journal-title":"Phys. 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