Photoionization of Xe inside C-60: Atom-fullerene hybridization, giant cross-section enhancement, and correlation confinement resonances

A theoretical study of the subshell photoionization of the Xe atom endohedrally confined in C (60) ist presented. Powerful hybridization of the Xe 5s state with the bottom edge of C(60) pi band is found that induces strong structures in the 5s ionization, causing the cross section to differ significantly from earlier results that omit this gybridization. The hybridization also affects the angular distribution asymmetry parameter of Xe 5p ionization near the Cooperminimum. The 5p cross section, on the other hand, is greatly enhanced by borrrowing considerable oscillator strength from the C(60) giant plasmon resonance via the atom-fullerene dynamical interchannel coupling. Beyond the C(60) plasmon energy range the atomic subshell cross sextions display confinement-induces oscillations in which, over the large 4d shape resonance region, the dominant 4d oscillations induce their "clones" in alldegenerate weaker channels known as correlation confinement resonances.