Ionization of K-shell electrons by electron or positron impact
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چکیده
The single ionization of inner-shell electrons by electron or positron impact are the fundamental processes, which still attract considerable interest in collision theory, experimental studies, and various applications. To predict the ionization cross sections, one usually employs either sophisticated numerical approaches or empirical and semiempirical formulas. Significant efforts have been also devoted to investigations of the scaling behavior of ionization cross sections with respect to the energy of the incident particles. We have deduced a universal scaling behavior for the cross sections of the single K-shell ionization of hydrogenlike ions with moderate values of the nuclear charge Z by electron or positron impact [1, 2]. The study is performed to leading order of non-relativistic perturbation theory with respect to the electron-electron interaction. Accordingly, it is assumed that αZ ≪ 1 and 1/Z ≪ 1, where α is the fine-structure constant. The energy of the projectiles E is considered to be within the range I ≤ E ≪ m, where I = m(αZ)/2 is the Coulomb ionization potential and m is the electron mass (h̄ = 1, c = 1). The total cross section for the single ionization of a Kshell electron can be cast into the following form
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تاریخ انتشار 2009