Abstract
Quenching of biacetyl phosphorescence by molecular iodine is very efficient. The energy transfer rate constant ((7.7 ± 0.5) × 10 6 Torr −1 s −1) indicates that biacetyl is deactivated on every collision. Dissociation of iodine is indicated as well as population of the B 3Π 0u+ state. A broad emission centred around 580 nm appears in the mixture. The assignment to the B state requires a non-statistical distribution of the vibrational level population.
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