Coupled channels in the distorted-wave representation

Publisher Website
Google Scholar
Abstract
The scattering of electrons or positrons to discrete states of an atomic target is represented in momentum space by coupled integral equations. By introducing a local central potential one may set up a distorted-wave representation for the integral equations, which can be solved to arbitrary numerical accuracy by quadratures. The perturbative solutions of these equations are the commonly used distorted-wave first- and second-order Born approximations. The full coupled on-shell solution is the distorted-wave unitarized Born approximation. These approximations are tested for charged and uncharged targets. The formalism for inclusion of configuration interaction in the target is described, making a complete theory for electron-atom scattering in a truncated channel space, which can be extended by optical potentials to a fully realistic situation.