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We investigate the role of virtual excitations of inner shells on the cross section ofthe outer shell photoionization. The calculations are performed in the frames of theRandom Phase Approximation and of its generalized versions GRPAE and GRPAE II, which takesinto account variation of the atomic field due to creation of holes in the inner shellsand due to their Auger decay, respectively. We employ both analytic approximations andnumeric computations. We present the numerical results for the cross sections ofphotoionization of 3p electrons in Ar and 4d-electrons in Pd near theinner shells thresholds. We focus on the cross-section outside the inner shell discreteexcitation region. The effect proved itself to be noticeable.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Influence of the inner shell electrons on photoionization of outer shells