The Method of Interacting Configurations in Complex Number Representation. Application for Calculations of Spectroscopic Characteristics of Quasi-Station ary States in Two Electron Systems

Abstract

The method of interacting configurations in complex numbers representation is formulated on the basis of Siegert’s complex energy formalism. The method is applied to the problem of electron impact ionization of atoms. The wave function of the atomic ground state is taken as multi-parametric variational one. The wave functions of the resonant electron-atom scattering are constructed. These functions take into account the excitation of arbitrary quantity of interacting quasi-stationary states of the ”electron plus ion” system. Such states may decay into arbitrary number of open bound channels. Within the formulated method the curves of differential generalized oscillator’s strengths are parameterized. The results of calculations of the positions, total and partial widths for the problem of helium atom ionization above the second ionization threshold of atom are presented.