Universal nature of diatomic potentials

A simple mathematical technique is introduced to establish the connection between the universality of diatomic potentials and correlation property of the Graves-Parr parameters β₁² (=a₁²/{Δ}) and β₂ (=a₂/{Δ}) [Phys. Rev. A 31, 1 (1985)]. On the basis of this universal feature of diatomic potentials, an accurate expression of the ground-state reduced potential valid for all diatomic molecules has been obtained.