Dynamic effective charge in the target continuum within the CDW-EIS model for ionisation in ion–atom collisions: angular dependence

In the present work, the consideration of a dynamic charge to describe the non-Coulomb potential of the residual target for ionisation in bare ion–multielectron atom collisions is studied. This is based on the well-known Belkic’s prescription. It is shown that using an emission-angle-dependent charge in the final residual target continuum state improves the doubly differential cross sections for backward emission angles. It appears as an excellent choice to avoid large time-consuming calculations, associated with the use of numerical continuum functions. Improving the physical description of the ionisation reaction whilst keeping calculation times as low as possible is necessary for multiple applications that require large cross sections databases.