Transition probability parameters of the swan and the fox-herzberg band systems of the C 2 molecule

Abstract

The vibrational perturbation between the A 3 Π g and B 3 Π g states of C 2 molecule has been investigated assuming that the unperturbed potential energy curves can be represented by the Morse potential function and that each one of the levels of the A 3 Π g ( B 3 Π g ) state is being perturbed by all the levels of the B 3 Π g ( A 3 Π g ) state. The Franck-Condon factors and r-centroids for the Swan and the Fox-Herzberg band systems have been computed by using the vibrational wave functions appropriate to the R-K-R (Rydberg-Klein-Rees) potential energy curves. The variation of the electronic transition moment with internuclear separation has been determined for the Swan band system. The relative intensities of the so-called high pressure bands have been calculated and it is found that the maxima of intensity lie at v′ = 5 and 8, as remarked by Herzberg, which supports the view that the high-pressure bands of C 2 molecule belong to the Swan system.