Variational approach to excitation in p+ Be3 + collisions at intermediate and high impact velocities

摘要

A variational impact parameter approach, based on the Schwinger principle, is used to study therndirect excitation for the single electron p+ Be3+ system (the beryllium ion is one of the mainrnimpurities in tokamak plasmas). Contribution of continuum intermediate states of the target, whichrnwere ignored in previous applications, are taken into account. The total excitation cross sectionsrnof hydrogenlike target are presented in the energy range of 16 KeV to 3.2 MeV and comparedrnto the theoretical results of Ermolaev et al [3]. The effect of the intermediate target continuum isrnfound to be important in the excitation of 2s states, mainly in the low energy range where therncoupling between excitation and capture is important.