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Spectroscopic Constants and Line Positions for TiO Singlet States

A consistent set of spectroscopic constants for the a1Δ, d1Σ+, b1Π, c1Φ, and f1Δ states of 48Ti16O has been determined from analysis of the b1Π–a1Δ, b1Π–d1Σ+, c1Φ–a1Δ, and f1Δ–a1Δ systems. Three Fourier transform emission spectra have been used for the analysis. New bands of the b1Π–a1Δ and c1Φ–a1Δ systems have been fitted. The first analysis of the c1Φ–a1Δ system using Fourier transform spectra is also provided. Extensive and improved line positions are measured. TiO is prominent in the spectra of oxygen-rich cool stellar objects and may be present in hot-Jupiter exoplanet atmospheres.