Analysis of the 3Π0,1−X 1Σ+ transition of gallium monoiodide

Bands of the A 3Π0−X 1Σ+ and B 3Π1−X 1Σ+ transitions of the 69GaI and 71Gal molecules, lying in the range 370–420 nm, have been excited in a hollow cathode discharge and analyzed. Six bands of the A-X system have been analyzed rotationally and the rotational constants of the A 3Π0 state determined. Former band measurements and vibrational assignments have been revised and extended. Vibrational constants of the A0+, B1 and X0+ states of the 69GaI molecule have been determined using band origins and for the excited states these constants are an improvement on previous results. Franck-Condon factors for the A-X and B-X bands have been calculated using the molecular constants obtained.