Theoretical Research On(e,2e)processes Of Atoms

It has been decades since the single ionization of atoms and molecules by electron impact, the so called(e, 2e) process, attracted researchers’ attentions as one of the fundamental problems in Atomic and Molecular Physics. So far, a large number of theories and experiments of the(e, 2e) reactions have been reported, and several theoretical models have been established and proved to be successful. In this paper,we report the calculations of relative triple differential cross section(TDCS) for the(e,2e) reactions of Ca, Ar, Kr in coplanar symmetric geometry by employing the distorted-wave Born approximation(DWBA). We have considered the effect of the target polarization, residual ion polarization and the postcollision interaction(PCI) in the present DWBA calculation. Reasonable improvement can be found when comparing the present results with previous experimental measurements and theoretical calculations. In addition, we have developed high order DWBA by inserting the continuum functions of the final states to deal with the Green operator for the first time. The absolute TDCS results for argon 3p orbital ionization by 200 e V electron impact have been obtained and represented in figures as a function of the low-energy electron emission angle. Excellent agreement can be found between the present high order DWBA calculations and experimental measurements.