Determination of the radiative lifetimes of nine ion-pair states of I 2

Abstract

The radiative lifetimes of 9 out of the 20 possible ion-pair states of I 2 have been measured using two-colour optical-optical double-resonance excitation. A pulse-shortened dye laser was used to populate the final state. Lifetimes for all six states in the first cluster - δ(2 u), γ(1 u), D(0 u +), D′(2 g) β(1 g) and E(0 g +) - have been measured again in view of the often d literature values. The lifetimes of three states in the second ion-pair cluster (H(1 u), F(0 u +) and f(0 g +)) are reported for the fir time. No significant pressure dependence was found up to 100 m Torr, with the exception of the longest lived γ state.