Application of linear density response theory to electron-impact autoionizing resonances

We apply the linear density response theory to the electron-impact ionization including autoionizing resonances of atoms. Such a single-electron-like method takes into account the electron-electron dynamic correlation effect through the first-order perturbation theory. The method allows us to study the dynamic correlation in the process of electron-impact excitation with ionization background. We take the autoionizing resonances of Ar atoms as an example to show the simpleness and effectiveness of the present method. Our calculated electron impact ionization cross sections including autoionizing resonances are in reasonable agreement with the experimental measurements