L Harris, A Morrison, K Coordinate system for projectile-helium atom system <p><strong>Figure 1.</strong> Coordinate system for projectile-helium atom system.</p> <p><strong>Abstract</strong></p> <p>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.</p> discrepancy;electron impact;core approximation;peak locations;wave model;Atomic Physics;Molecular Physics 2013-06-26
    https://iop.figshare.com/articles/figure/_Coordinate_system_for_projectile_helium_atom_system/1012142
10.6084/m9.figshare.1012142.v1