LASER-INDUCED FLUORESCENCE STUDY ON THE QUNECHING RATES OF ELECTRONICALLY EXCITED SULFUR DIOXIDE WITH ALCHOLS

The relaxation kinetics for the electronically excited SO2(1A2) was investigated by measuring the time profiles for the laser-induced fluorescence intensities after the excitation of Clements F band of SO2 molecules at around 303 nm. The semi-log plots for these time profiles were bent at 150 μs after the UV-laser excitations and thus co-existence of the fast and slow relaxation mechanisms was suggested for the relaxation of the electronically excited SO2(1A2). The quenching rate constants of the electronically excited SO2(1A2) with several kinds of alcohols were also investigated and it was found that the collisional quenching cross sections σq were well correlated with the well-depth ε of the interactions between the bath gases