Charge exchange in Li2+(1s) + H(1s) collisions. A molecular approach including two-electron translation factors

We calculate the cross section for the charge exchange process in Li2+(1s) + H(1s) collisions, using an eight term molecular expansion that includes a two-electron common translation factor. The results are stable with respect to the variations of the parameters included in this translation factor. At low velocities (v < 0.5 a.u.) the most important contribution to the total cross section is due to transitions in the neighbourhood of the 1 3Σ - 2 3Σ pseudo-crossing (for R < 9 a.u.). For v larger than 0.5 a.u. a three state 1 3Σ - 3 3Σ - 1 3PI mechnanism becomes dominant. The agreement with experimental data is good at low velocities (0.5 < v < 0.8 a.u.)