The Significance of the Δkl Parameters in the Vibration-Rotational Energies of Diatomic Molecules

Abstract
We discuss the physical significance of the parameters Δkl that arise from mostly the adiabatic and nonadiabatic effects in the vibration-rotational energles of diatomic molecules for which data from isotopic variants are available. Examples are given of the use c f these parameters to derive radial functions for HC1 and LiH. Similar to those for the Ukl coefficients, relations among the Δkl coefficients have been developed, but caution is urged in their use.