TOTAL AND PARTIAL CROSS-SECTIONS OF ELECTRON-TRANSFER PROCESSES WITH HYDROGEN GAS TARGETS - BE4-2(+H)

We report the implementation of programs to treat electronic transitio ns in ion-molecule collisions and the calculation of vibrationally-res olved partial cross sections. This includes the ab initio calculation of non-adiabatic coup lings, the implementation of a block-diagonaliza tion procedure, and the evaluation of vibrational transition probabili ties. 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. T hese show that for nuclear velocities upsilon < 0.2 a.u. vibration can not be ignored, even though anisotropy effects are small. The reason i s the strong dependence of the electronic transition amplitudes on the H-H distance.