New clothes for an old player: Oxygen-induced deactivation of a fluorescent state can, in fact, proceed via S1→S0 internal conversion and effectively compete with S1→T1 intersystem crossing (see figure). It has long been considered that only the latter process occurs. An O2-dependent process that does not produce a triplet excited state can have significant photochemical and photobiological consequences.
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Cabrerizo et al. (2010) studied this question.
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