A simple classical model based on linear response was developed to include binding-energy effects in the entrance channel for ion-atom ionization. The resulting theory was use for helium single ionization by singly and multiply charged ions. It was confirmed that distorted wave theories are sensitive to the choice of the initial state and that binding-energy effects for the active electron should be taken into account in initial-state distortions for intermediate impact energies. The results show that modified continuum distorted wave (CDW) approximation includes the active electron binding energy in the distorted wave description of the initial state.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|State||Published - Dec 2004|