Franck-Condon factors and r centroids for the B-X and C-X systems of the MgF molecule

Arrays of Franck-Condon factors (q νprimeν−or+ ) and r centroids ( r νprimeν−or+ ), which are closely related to relative vibrational transition probabilities, have been computed upon a Morse model for the B - X and C - X systems of the MgF molecule. This molecule is of importance to astrophysicists as it occurs in the spectra of sunspots. The r centroids for a given ( νprime, ν−or+ ) band have been found to decrease smoothly with increase of corresponding wavelength λ νprimeν−or+ . The value of Δ r identical with r νprime + 1, ν−or+ + 1 - r νprimeν−or+ in a sequence has also been found to remain constant. The computed values of the r centroids indicate that the potentials are neither very anharmonic nor very wide.