Abstract
For autoionizing levels converging to the N = 3 threshold of He-like ions with Z = 3–26, energies and widths obtained within the generalized diagonalization approach are compared with the results of S-matrix perturbation theory. The combined data for the expansion coefficients can improve the validity of spectral calculations. Autoionization decay amplitudes and widths are obtained using both unscreened and screened hydrogenic orbitals for the free electron, as well as in the first order in continuum Coulomb coupling. Terms of order 1/Z can be extracted to improve the perturbational data for autoionization amplitudes, involving both screening corrections and the first-order continuum coupling. The relative significance of various atomic interactions in evaluating autoionization decay amplitudes is discussed.
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