Plasma Effect on Ionization Process of Fast-Electron and Hydrogen

Plasma effects can't be neglectful in the atomic structures, photo-excitation and ionizations and electron-impact excitation process, which are shown in the our previous works and other researcher's papers. In the present work, plasma effects on the high energy electron-impact ionization process of Hydrogen-like ions embedded in weakly coupled plasmas are investigated in the first Born approximation. The screening of Coulomb interactions decreases the ionization energies and changes the behaviors of the wave functions, and then the multiple shapes and the virtual-state resonances appear in the single differential cross sections when the plasma screening parameter passes through a certain critical value. The number of the summation for the angular-momentum states in the generalized oscillator strength densities is reduced for the same ratio between the ejecting energy and the ionization energy for the different plasma condition; the contributions from the lower-angular-momentum states dominates the generalized oscillator strength densities, the accessional minima and the outstanding enhancement emerge in the generalized oscillator strength densities in a certain energy region, whose position and width are related to the plasma screening effect. The local maximum exists in a smaller scattering angle for the double differential cross section, which is dependent of the plasma effect on the incident electron. (author)