Vibrational transition probabilities of the bands of the BaO (A 1Σ-x 1Σ) system

The band spectrum of BaO has been obtained by spraying barium chloride solution into a flame. The integrated intensities of the bands have been determined by photographic photometry. The experimental results along with the theoretically computed Franck-Condon factors have been used to evaluate a relation between R e , the electronic transition moment, and r , the internuclear separation, in the form R e ( macronr νprimeνPrime ) = constant (1 - 0·536 r ). This relation has been used to obtain improved Franck-Condon factors. The theoretically computed Franck-Condon factors, with and without the inclusion of R e variation, have been compared with the experimental band strengths.