Total and partial cross sections of electron transfer processes with hydrogen gas targets: Be4++H-2

We report the implementation of programs to treat electronic transitions in ion-molecule collisions and the calculation of vibrationally-resolved partial cross sections. This includes the ab initio calculation of non-adiabatic coup lings, the implementation of a block-diagonalization procedure, and the evaluation of vibrational transition probabilities. Using a two-state basis, we present some preliminary results on the Be4+ + H-2(nu=0, L=0)-->Be3+(3l)+H-2(+)(nu, Sigma(LM)) reaction. These show that for nuclear velocities upsilon < 0.2 a.u. vibration cannot be ignored, even though anisotropy effects are small. The reason is the strong dependence of the electronic transition amplitudes on the H-H distance.