Quantum yields of S1→ T1 intersystem crossing in 1,3-dichloro-tetrafluoroacetone have been measured using the technique of biacetyl sensitization. The vibrationally-relaxed singlet state of the molecule intersystem crosses to a dissociative triplet with quantum yield 0.92. Vibrationally-excited singlet-state molecules do not intersystem cross, but may dissociate in two ways.
P. A. Hackett and D. Phillips, J. Chem. Soc., Faraday Trans. 1, 1972, 68, 329 DOI: 10.1039/F19726800329
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