Calculations of molecular constants for the ground electronic states of alkali metal dimers based on combined potential energy curves

Potential energy curves were constructed for the ground electronic states of alkali metal dimers in a wide range of internuclear distance variations. Each curve was a combination of three potential functions (the perturbed Morse oscillator, Rydberg-Klein-Ries, and van der Waals functions), which well approximated different portions of real diatomic molecule potentials. These potential curves were used to calculate molecular constants. The results were compared with those obtained from the experimental data.