Electron impact ionization of neon and neonic ions under distorted-wave Born approximation

The (e, 2e) triple differential cross sections of 2s orbitals of neon and neonic ions (Z=11-14) are calculated using a distorted-wave Born approximation under coplanar asymmetric geometry. The calculated results show that, with the increase in the nuclear charge number Z, the amplitude of triple differential cross sections decreases. The angle difference between the binary peak position and the direction of momentum transfer gradually increases with the increase in the nuclear charge Z, and a new structure appears at an ejected angle 90°<θ ₂<120°. Three kinds of collision processes are proposed to illustrate the formation mechanism of such collision peaks.