(e, 2e) triple differential cross sections for the ionization of Ar(3p) by 70.8 eV electron impact are calculated in the coplanar asymmetric geometry using the modified distorted-wave Born approximation, and compared with the recent experimental data of Ren et al. [Ren et al. 2012 Phys. Rev. A 85 032702]. The results show that electron exchange effect and post-collision interaction play an important role in the(e, 2e) process of low-energy electron impact.
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