Triple differential cross sections of Li+ (1s2) and K+ (3p6) for electron-impact ionization

The triple differential cross sections (TDCSs) of electron-impact ionization for ions (Li+ (1s2) and K+ (3p6)) and atoms (He (1s2) and Ar (3p6)) have been calculated at coplanar asymmetric geometry using the distorted wave Born approximation method. The features of binary peaks in the TDCSs of ions are compared with those of corresponding atoms. Differences of positions of binary peaks between ions and atoms indicate that the usual single-binary encounter mechanism, which is a good description of the electron collision with atoms, cannot describe the electron collision with ions well. A double-binary encounter mechanism is proposed to describe the electron collision with ions.

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