Theoretical electronic structure including spin-orbit effects of the alkali dimer cation Cs2+

A theoretical study of the electronic structure of Cs2+ has been performed, including or not spin-orbit coupling. Potential energy curves for all the molecular states dissociating up to the limit Cs+ + Cs (8s 2S1/2), i.e 26 states in the representation 2Λg,u+ and 38 states in the representation Ωg,u, are displayed. Equilibrium distances, transition energies and depths for the wells predicted at short and large range of internuclear separation R are reported. The existence of some of the long-range wells are confirmed by a long range model. Extensive tables of energy values versus internuclear distances are available at the following address: http://lasim.univ-lyon1.fr/allouche/cs2plus.htm.