Abstract
Following the ideas of Senashenko we obtain an expression for the resonant part of the auto-ionizing transition matrix consisting of the standart first Born expression, and an additional factor containing the remaining effects of Post-Collision-Interaction. This factor becomes very important when one studies the angular dependence of auto-ionization from spherical symmetric auto-ionization states. We in particular concentrate on decay form the (2s2)1S state since an experimental investigation of this process has recently been published.
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