Single-photon ionisation of TMPD in liquid CCl4 observed by time-resolved microwave conductivity

Abstract A large microwave conductivity change is observed on laser flash photolysis (308 nm) of a solution of TMPD in CCl 4 . This is ascribed to single-photon ionisation of the solute resulting in the formation of a stable TMPD + Cl − ion pair. The dipole moment of the ion pair is estimated to be (8.7 ± 0.9)(φ*) − 1 2 where φ* is the quantum efficiency for ion-pair formation.