The potential energy function for O2 X(3∑−g ) and the transition dipole moment of the Schumann–Runge band near X-state dissociation

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Abstract
Emission spectra were analyzed for transitions of O2 (B 3∑−u, v’→X 3∑−g, v‘) with v‘ as high as 35. The X 3∑−g potential energy function, Vx (r), was determined nearly to the dissociation limit with an estimated accuracy of ±50 cm−1. Vx (r) is compared to the highest level ab initio calculation available. The transition dipole moment function, μ(r), for the O2 Schumann–Runge band is also extended almost to the dissociation limit. The O2 molecule now provides one of the best testing grounds for ab initio theories of dissociation and radiation.