Studies of the electronic states of the BaF molecule

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Abstract
This paper is concerned with the study of the 5d states, A′ 2Δ, A 2Π and B 2Σ+, (v = 0, 1, 2). It is shown that a complete interpretation of the spectra involving the 5d (v = 0, 1 and 2) states requires a 15 × 15 representation to take account of the spin-uncoupling interaction between A′ 2Δ5/2 (v) and A′ 2Δ3/2 (v + 1). In the final analysis, the wavenumbers of the 4417 observed lines are fitted simultaneously and reporduced to within a standard deviation of 0·004 cm-1. Deperturbed energies and rotational constants for the v = 0, 1 and 2 levels of the 5d states are obtained. Values of the spin-orbit and rotational interaction constants within this group of 5d levels and of the spin-uncoupling constants B Δ 01 and B Δ 12 are determined. The implications of the results for the nature of the binding in the 5d states are briefly discussed.