The A-X and B-X transitions of BO

Abstract
The A 2 Pi j-X2 Sigma + and B2 Sigma +-X2 Sigma + transitions of BO have been analysed for the two isotopic species 11BO and 10BO. Rotational and vibrational constants have been determined with a good accuracy for the three electronic states involved. An unreported perturbation in the nu '=8 level of the A 2 Pi i state has been interpreted as due to the nu "=20 vibrational level of the X 2 Sigma + ground state.