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Compared with triplet metal\u2010to\u2010ligand charge transfer (<jats:sup>3<\/jats:sup>MLCT) states, charge\u2010separated (<jats:sup>3<\/jats:sup>CS) excited states involving organic moieties, such as triplet intra\u2010ligand or ligand\u2010to\u2010ligand charge transfer (<jats:sup>3<\/jats:sup>ILCT and <jats:sup>3<\/jats:sup>LLCT) states, tend to possess longer\u2010lived excited states due to the weak spin\u2010orbit coupling with the closed\u2010shell ground state. Thus, the combination of inorganic and organic chromophores enables isolating the triplet states onto the organic chromophore. In this study, we aim to elucidate the excited\u2010state relaxation processes in a Ru(II)\u2010terpyridyl donor\u2013acceptor\u2013donor system (<jats:bold>RuCl<\/jats:bold>) in a joint spectroscopic\u2010theoretical approach combining steady\u2010state and time\u2010resolved spectroscopy as well as quantum chemical simulations and dissipative quantum dynamics. The electron transfer (ET) processes involving the low\u2010lying <jats:sup>3<\/jats:sup>MLCT, <jats:sup>3<\/jats:sup>ILCT, and <jats:sup>3<\/jats:sup>LLCT excited states were investigated experimentally and computationally within a semiclassical Marcus picture. Finally, dissipative quantum dynamical simulations\u2014capable of describing incomplete ET processes involving all three states\u2014enabled us to unravel the competitive relaxation channels at short and long timescales among the strongly coupled <jats:sup>3<\/jats:sup>MLCT\u2010<jats:sup>3<\/jats:sup>ILCT states and weakly coupled <jats:sup>3<\/jats:sup>MLCT\u2010<jats:sup>3<\/jats:sup>LLCT and <jats:sup>3<\/jats:sup>ILCT\u2010<jats:sup>3<\/jats:sup>LLCT states.<\/jats:p>","DOI":"10.1002\/chem.202404671","type":"journal-article","created":{"date-parts":[[2025,4,22]],"date-time":"2025-04-22T05:15:37Z","timestamp":1745298937000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Excited State Branching Processes in a Ru(II)\u2010Based Donor\u2013Acceptor\u2013Donor 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