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Triplet state energy dependence of the competitive formation of O2(1Σ+g), O2(1Δg) and O2(3Σ−g) in the sensitization of O2 by triplet states

✍ Scribed by M. Bodesheim; M. Schütz; R. Schmidt

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
752 KB
Volume
221
Category
Article
ISSN
0009-2614

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✦ Synopsis

Time-resolved emission spectroscopy of 0s ( 'Z: ) and 0s ( 'As) in CCL was used to determine the rate constants kl, , b, and k+ of the triplet state (T,) sensitized formation of the 'Z:, 'As and 'Z; states of 0s. 13 sensitizers of triplet energies 140 GE,< 309 kJ mol-' were investigated. The data are analyzed with respect to the excess energies AE of the corresponding deactivation paths. They follow a common dependence on Al?. The rate constants reach maximum values around AE= 60 kJ mol-' and decrease subsequently exponentially with increasing AE. This dependence on AE is much weaker than expected by previous theories and is explained by the intermediacy of exciplexes "'(T, 32). Above AE=240 kJ mol-' ks, increases strongly with AE.

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