Ab initio studies of collisions between Li+ions

Self-consistent-field and configuration interaction procedures are used to calculate the potential energy curves and the non-adiabatic radial and rotational couplings for the Li 2 2+ system. The lowest six 1 Sigma g , four 1 Pi g and one 1 Delta g states are included. The standard perturbed stationary-state approach is employed to study collisions between Li + ions for the interaction energies between 10 and 80 keV. The calculated charge transfer cross sections are in good agreement with the observations of Li 2+ formation for energies above 35 keV.