Spin-orbit coupling of charge-transfer states and the mechanism for quenching singlet oxygen by amines

Photochemistry and Spectroscopy of Singlet Oxygen in Solvents. Recent Advances which Support the Old Theory

“…But the explanation of temperature dependences of non-radiative rate constant for a→X transition [37] is not very consistent since the authors apparently ignore the results of Ref. [43]. First of all, the activation barrier for the O 2 (…”

“…4 the CT states with different spin symmetry in order to stress that they will be admixed to the triplet O 2 ( Fig. 4 but is similar to its triplet counterpart) [43]. Just the 1 CT x and 3 CT y states shown in Fig.…”

“…They consider the potential energy curves (PECs) for both states, O 2 ( ) species, presented thirty years ago [22,23,43], can be used to explain the results of recent experiments [35][36][37][38].…”

“…Unfortunately, the theory of singlet oxygen quenching by amines in gas phase [43] has not been taken into account so far in a great literature on ∆ τ measurements and interpretations [29][30][31][32][33][34][35][36][37][38][39][40]. In the recent papers of P. Ogilby et al [37,38] a deep understanding of the old theory [11,23] is achieved and the theory is supported in many details by fine and elaborated laser experiments.…”

“…[43]. Then, the old theory [43] We chose in Fig. 4 the CT states with different spin symmetry in order to stress that they will be admixed to the triplet O 2 ( Fig.…”