Valence photoionization of small alkaline earth atoms endohedrally confined in C$_{60}$: From the many-electron collectivity to single-electron interferences

Results of a theoretical study of the photoionization from outermost orbitals of Be, Mg and Ca atoms endohedrally confined in C$_{60}$ are presented. The fullerene ion-core of sixty C$^{4+}$ ions is smudged into a continuous jellium distribution while the delocalized cloud of carbon valence electrons, \textit{plus} the encaged atom, are treated in the time-dependent local density approximation (TDLDA) [1]. Systematic evolution of the mixing of outer atomic level with the C$_{60}$ band is detected along the sequence. This is found to influence the plasmon-driven enhancement at low energies and the geometry-revealing confinement oscillations from multi-path interferences at high energies in significantly different ways. The study paints the first comparative picture of the atomic valence photospectra for alkaline earth metallofullerenes in a dynamical many-electron framework [2].\\[4pt] [1] M.E. Madjet et al., \textit{Phys. Rev. }A \textbf{81}, 013202 (2010)\\[0pt] [2] M.H. Javani et al., \textit{to be published}.