Many-body effects in autoionizing states of krypton isoelectronic sequence

The paper is devoted to the theoretical investigation of weak resonance structure associated with 45 -» np transitions in atomic Kr and its isoelectronic ions Rb+, Sr2*, Y3+. The calculating method, which combines inter-channel interaction, dynamic polarization and screening effects to get the resonance parameters with many-electron correlations taken into account, is developed. Cross section curves and Fano's parameters for transitions to the low lying excited states are obtained within the frame of this method. The resonance profile changes from "window"-type structure to Lorentz-like peaks along Kr isoelectronic series.