Subshell-resolved photoionization in the reciprocal space: Metal and noble gas atoms in a fullerene cage

Theory has predicted oscillations in the photoionization cross section of various atoms trapped in C$_{60}$. Most of the studies however modeled the confining shell by a simplistic one-active-electron potential. We recently established a method that treats the C$_{60}$ electrons in a sophisticated multi-electron frame based on the density functional theory [1]. Using this method, we perform calculations for noble gas atoms in C$_{60}$. In the past, the free C$_{60}$ photo cross section, which also shows oscillations, was analyzed by a Fourier-transform technique to determine the origin of the oscillation [2] and its dependence on the electron's rotational motion [3]. In the present work, we employ the Fourier analysis to unravel the interplay between specific ionization modes that induces oscillations in the cross section of a confined atom. The quality of oscillations is found to strongly differ from the outermost to an inner subshell. [1] Madjet et al., J. Phys. B \textbf{41}, 105101 (2008); [2] Ruedel et al., Phys. Rev. Letts. \textbf{89}, 125503 (2002); [3] McCune et al., J. Phys. B FTC \textbf{41}, 201003 (2008).