An electronic emission spectrum has been obtained from a carrier identified as the diatomic molecule TiN. The system, which occurs in the red, has been analyzed as 2 Π r → (X) 2 Σ, and it appears to be the analogue of the orange–red systems of the isoelectronic molecules CaF and ScO.The lower (ground?) state has B 0 ″ = 0.6211 cm −1 corresponding to r 0 ″ = 1.583 Å, whereas the excited 2 Π r state has B 0 ′ = 0.6103 cm −1 . The system has a well-defined homogeneous perturbation in the excited state, showing the presence of a second, unobserved, 2 Π term.
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Dunn et al. (1970) studied this question.