Model potential calculations of potential energies of excited states of Li+2

Detailed calculations of the interaction potentials of several electronic states of the Li⁺₂ molecule have been carried out in which the molecule is described as a single electron moving in the field of two polarizable cores. Comparison with the ab initio many-electron calculations of Michels suggests that high accuracy has been achieved at intermediate and large separations. An analysis of the long range behaviour is presented.