Absorption and resonance emission spectra of SO2(X̃1A1/C̃1B2) calculated from ab initio potential energy and transition dipole moment surfaces

We report here an analytical fit of the transition dipole moments between X̃1A1 and C̃1B2 electronic states of SO2 calculated using a high level ab initio method. The absorption spectrum as well as the resonance emission spectra from several low-lying C̃1B2 vibrational levels are calculated using a newly developed ab initio potential energy surface (PES) and the transition dipole functions. The calculated spectra are in semi-quantitative agreement with available experimental data. A strong non-Condon effect is found for the emission spectra.