Calculations for electron-impact ionization of beryllium in the method   of interacting configurations in the complex number representation
  The beginning of the application of the method of interacting configurations in the complex number representation to the compound atomic systems has been presented. The spectroscopic characteristics of the Be atom in the problem of the electron-impact ionization of this atom are investigated. The energies and the widths of the lowest autoionizing states of Be atom are calculated. 
V.M. Simulik, T.M. Zajac, R.V. Tymchyk
physics.atom-ph