Photochemistry of 1,3-DichIoro-tetrafluoroacetone: Part 2.—The Triplet State

Abstract

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.