3 B 1-1A1 transition of SO2 gas. I. Franck-Condon treatment and transition moments

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Abstract
Absorption and emission spectra for the 3B1‐1A1 transition in SO2 gas are reported and subjected to a Franck‐Condon type of analysis. It is shown that the transition moment varies rapidly with bond angle, and a modification of the usual Franck‐Condon factors is necessary to deal with this case. The bond length and angle of the excited state are calculated to be 1.491 ± 0.002 Å and 126.1 ± 0.1°, respectively, in good agreement with values from rotational analysis. The oscillator strength of the absorption band is estimated to be (3.34 ± 0.12) × 10−7.