Abstract

We present the absolute triple differential cross section (TDCS) for single ionization of $\mathrm{Ne}(2p)$ at an impact energy of 599.6 eV and $\mathrm{Ar}(3p)$ at 195 eV. The role of the postcollision interaction (PCI) is studied using a high-order distorted-wave Born approximation model with a continuum distorted-waves expansion. Both the second- and third-order effects are considered in the present calculations, and the third-order distorted wave Born approximation model is reported in the $(e,2e)$ reaction. The calculated results show satisfactory agreement with experimental data. The magnitude of the absolute TDCS is enhanced by a factor 2--3 when the strength factor $\ensuremath{\gamma}$ of the PCI amplitude is summarized just from 0 to 2. This proves that the PCI plays an important role in the absolute TDCS of the $(e,2e)$ reaction in the intermediate-energy region.

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