The potential energy curves for the ground state of diatomic H2 and N2+ molecules are constructed techniques using the five-parameter H-H function. The estimated dissociation energies are 4.61 ± 0.1 eV and 8.70 ± 0.20 eV for H2 and N2+ respectively. The estimated D0 values are in good agreement with literature values. The r-Centroids and Franck-Condon factors for the bands of C1∏u → X1Σ+g of H2 and A2∏u1 → 4Σu+ X of N2+ molecules have been determined. The Franck-Condon factors are evaluated by the approximate analytical method of Jarmain and Fraser. The absence of the bands in these systems is explained.

The ground and excited state dissociation energies are determined by curve fitting techniques using the five parameters Hulburt-Hirschfelder (H-H) function. The estimated dissociation energies are 7.33± 0.15eV, 2.90 ± 0.13 eV and 6.04± 0.12eV for NdO, FeH and BaF respectively. The computed values are in good agreement with the literature values. The nature of binding is discussed in the light of the percentage ionic\characters of these molecules.