The effect of the vibration-rotation interaction on the Franck-Condon factors for the band system of the RbH molecule

The Rydberg-Klein-Rees (RKR) potential energy curves of the x 1 Σ + and A 1 Σ states of the RbH molecule have been calculated by the numerical integration of the Klein's equations. It has been found that for all the vibrational levels, the resultant RKR curves satisfy the quantization condition with an accuracy to 0.05% or less. The vibrational wave functions appropriate to the RKR curves yield the values of B v which are in close agreement with the experimental results. The vibrational wave functions corrected for the effect of the vibration-rotation interaction have been obtained for a number of vibrational-rotational energy levels. The Franck-Condon factors, the r centroids and the relative intensities have been computed. The results indicate that there is a significant effect of the vibration-rotation interaction on the Franck-Condon factors and on the relative intensity distribution.