Abstract
The emission spectrum of the BaO molecule corresponding to B → X transitions has been studied experimentally using a d.c. arc with barium electrodes in an oxygen atmosphere. No Q branches were observed. This result implies a Σ 1 → Σ 1 transition for the system. In addition, the data on the singlet system, A′ 1Π → X 1Σ, have been reviewed to establish valid molecular constants for the states involved and Frank-Condon factors and r-centroids corresponding to wavefunctions for a Morse potential have been calculated using these constants.
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