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A charge\u2010transfer process was demonstrated to be involved in the chemiluminescence process. Present and previous results allow us to define an interstate crossing\u2010induced chemiexcitation (ICIC) mechanism for the chemiluminescence of dioxetanones. Charge transfer is needed to reach a transition state, in the vicinity of which direct population of excited states is possible. The chemiexcitation process is then governed by singlet\/triplet intersystem crossings. Structural modifications then modify the rate of these crossings and the singlet ground and excited\u2010state interaction, thereby modulating the efficiency of this process and the spin of the resulting products.<\/jats:p>","DOI":"10.1002\/cphc.201200872","type":"journal-article","created":{"date-parts":[[2013,2,5]],"date-time":"2013-02-05T15:39:22Z","timestamp":1360078762000},"page":"1071-1079","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Interstate Crossing\u2010Induced Chemiexcitation as the Reason for the Chemiluminescence of Dioxetanones"],"prefix":"10.1002","volume":"14","author":[{"given":"Lu\u00eds","family":"Pinto da Silva","sequence":"first","affiliation":[]},{"given":"Joaquim C. 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