Abstract
The cross section for projectile impact excitation–ionization of helium is calculated, including spatial correlation, time-ordering, and interference between autoionizing and continuum states. The computational load is greatly reduced by using configuration-interaction (CI) helium wave functions and continuum pseudostates, yielding a scattering amplitude that is a sum of analytical terms for the first-order and energy-conserving second- and third-order contributions, and a one-dimensional integral for the energy-nonconserving second-order contributions. Comparison is made with experiment.
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