“…In the case of K shell ionization cross section by electron impact, a number of recent results are available. Particularly, several theoretical approaches were developed; some of them are based on the binaryencounter Bethe (BEB) model [35], other ones, on the partial wave first Born approximation (PWBA) [36][37][38][39], and other ones, on the distorted wave first Born approximation (DWBA) [38,40,41]. In addition, semiempirical expressions [42][43][44] and experimental data [45][46][47][48][49] were obtained during the last years.…”