Intensity Measurements on the CO⁺ Comet Tail, and the BO α and β Molecular Band Systems

Relative band intensities of the comet tail system (A²Π-X²Σ) of CO⁺ and of the α(A²Π-X²Σ) and β(B²Σ-X²Σ) systems of BO have been measured photoelectrically. They have been interpreted with the aid of Franck-Condon factors q_{ν'νdouble prime} and r-centroids r_{ν'νdouble prime} to show the variation of electronic transition moment R_e(r) with internuclear separation r and thereby to give `smoothed' arrays of relative vibrational transition probabilities p_{ν'νdouble prime} and intensities at infinite temperature I_infinity. The isotope effect on the Franck-Condon factors and intensities in the case of ¹⁰BO and ¹¹BO band systems has been examined.