Improved Five-Parameter Exponential-Type Potential Energy Model for Diatomic Molecules**Supported by the National Natural Science Foundation of China under Grant No. 10675097 and the Sichuan Province Foundation of China for Fundamental Research Projects under Grant No. 2018JY0468

Abstract

The dissociation energy and equilibrium bond length as explicit parameters are used to establish an improved five-parameter exponential-type potential energy model for diatomic molecules. We demonstrate that the five-parameter exponential-type potential is identical to the Tietz potential for diatomic molecules. It is observed that the improved five-parameter exponential-type potential can well model the internuclear interaction potential energy curve for the ground electronic state of the carbon monoxide molecule by the utilization of the experimental values of three molecular constants.