Coordinate system for projectile-helium atom system
Figures are generally photos, graphs and static images that would be represented in traditional pdf publications.
Figure 1. Coordinate system for projectile-helium atom system.
The frozen core approximation has been successfully used for many years to model 4-body collisions as 3-body collisions. We present a comprehensive comparison of 3-body and 4-body models for the process of single ionization of helium by electron impact using our 4-body distorted wave model. Differences between the two models are observed in both magnitude and peak locations. We identify four possible sources for the discrepancies between the models, and isolate the specific physical causes of the discrepancies.