Rotational analysis of four bands of the γ′(B3Π–X3Δ) system of TiO

Abstract

The (0,0), (1,0), (0,1), and (1,1) bands of the γ′(B3Π–X3Δ) system of TiO have been rotationally analysed up to J = 55. Accurate molecular constants have been determined for the ν = 0and ν = 1 levels of the B3Π and X3Δ states. The three substates of the B3Π state all show significant Λ-type doubling, which has been analysed using a full matrix treatment. Our new results give corrected values for the ground state spin–orbit splittings; they also illustrate very clearly the problem of the correlation of the various centrifugal distortion parameters appearing in the Hamiltonian for a triplet electronic state.