Relaxation kinetics on the first excited singlet state of SO2 from time resolved emission spectra

The relaxation kinetics on the first excited singlet state ((1)A(2)) of SO2 have been studied from time-resolved emission spectra in the 300-450 nm region. Two rovibronic levels belonging to the Clements E-band and the (1)A(2)(0,8,1) level, which are located above and below the origin of the B-1(1) state, respectively, were excited to investigate the role of the B-1(1) state on the relaxation kinetics. Direct emissions from the Laser excited rovibronic levels in the (1)A(2) state and direct intersystem crossing between the (1)A(2)(0,8,1) and B-3(1) states were observed and revised relaxation kinetic schemes are proposed