On the pseudoharmonic oscillator as a model for the electronic potential-energy function of a diatomic molecule

We show that the vibration-rotational energies of some diatomic molecules obtained some time ago are incorrect. The authors resorted to the experimental dissociation energy to construct the electronic potential-energy function by means of the pseudoharmonic potential that does not allow dissociation. Besides, the restriction of the angular momentum quantum number exhibited by their results is incorrect from mathematical and physical points of views.