Abstract
Abstract The true potential-energy curves of the B 2 Σ + and X 2 Σ + states of the MgF molecule have been obtained by the Rydberg-Klein-Rees method as modified by Vanderslice et al. from the band-spectroscopic data. The dissociation energy of the molecule is estimated from the three-parameter Lippincott function. The bands of this molecule are found in the disk and spot spectra and as such are astrophysically important. Therefore, the -centroids and Franck-Condon factors for the B 2 Σ + -X 2 Σ + system of this molecule are calculated. The values of the Franck-Condon factors as determined by an approximate analytical method of Fraser and Jarmain compare very well with those obtained by Bates's method. From a study of the Franck-Condon factors it has been positively concluded that the bands 3, 0 and beyond in the v ' progression with v ″ = 0 and the bands 0, 3 and beyond in the v ″ progression with v ' = 0 cannot be observed. Further the negligibly small Franck-Condon factors for the bands of 0, 2; 2, 0; 3, 1 and 4, 1 are the reason why they have not been observed.
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