Rotational analysis of the BaI C2Π–X2Σ+ (0,0) band

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Abstract
Rotational analysis of the BaI C2Π–X2Σ+ (0,0) band system has been performed using molecular beam and laser spectroscopic techniques. This band is free from local perturbations, although significant interaction of the C2Π state with several other 2Σ+ states is indicated. The spin-orbit ordering of the C state is confirmed to be regular, while the Λ-doubling parameters p and q are opposite in sign. Apparent anomalies in the line strengths of various rotational branches in the two spin-orbit sub-bands are related to observed differences in the hyperfine structure of the C-state spin-orbit components.

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