Effect of plasma oscillations of C60 collectivized electrons on photoionization of endohedral noble-gas atoms

It is demonstrated that outer and inner electron shells, including that formed by collectivized electrons of the fullerene C-60, affects dramatically the cross section of the subvalent ns subshells of the noble-gas endohedral atoms A@C-60. The calculations are performed within the framework of a very simple, so-called "orange skin," model that makes it possible, in spite of its simplicity, to take into account the modification of the ns subshell due to its interaction with inner and outer atomic shells, as well as with the collectivized electrons of the C-60. As a concrete example, we consider the Xe 5s electrons completely collectivized by the powerful action of the Xe close and remote multielectron neighboring shells.