Vibrational transition probabilities of the bands of the barium oxide (A 1SIGMA-​X 1SIGMA) system

The band spectrum of BaO has been obtained by spraying BaCl2 soln. into a flame. The integrated intensities of the bands have been detd. by photographic photometry. The exptl. results along with the theoretically computed Franck-​Condon factors have been used to evaluate a relation between Re, the electronic transition moment, and r, the internuclear sepn., in the form, Re(r v'v'') = const.(1 - 0.536r)​. This relation has been used to obtain improved Franck-​Condon factors. The theoretically computed Franck-​Condon factors, with and without the inclusion of Re variation, have been compared with the exptl. band strengths