Post-collision interaction in double Auger processes

A post-collision interaction (PCI) in the inner-shell photoionization followed by a double Auger decay is considered. The general analytical expressions for an amplitude and a cross section of the process under consideration are obtained. These formulae allow for the PCI distortion and are valid for a wide range of velocities of the photoelectron except a near-threshold region. The possibility of observing the PCI effects in triple- and double-coincidence experiments is discussed. The results of our approach are applied to the case of the Xe -photoionization followed by the double Auger decay.

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