  We have studied the role of virtual excitations of inner shells upon outer
shell photoionization. The calculations were performed in the frames of the
Random Phase Approximation and its generalized version GRPAE that take into
account variation of the atomic field due to electron elimination and the inner
vacancies decay. We employ both analytic approximation and numeric
computations. The results are presented for 3p electrons in Ar and 4d-electrons
in Pd near inner shells thresholds. The effect proved to be noticeable.
