Revived Confinement Resonances Near Inner Subshells Thresholds in Photoionzation Time Delay of Confined Atoms

We predict the revival of confinement resonances in the Wigner time delay in outer atomic shell photoionzation near inner shell thresholds. The near-threshold revival of confinement resonances in the time delay is caused by inter-shell correlation and serves as a sensitive probe of this effect. The revival is present even when the inner and outer shell thresholds are hundreds of electron volts apart. We illustrate this observation with a theoretical study of the outer shells of the Noble Gases (Ne, Ar, Kr, and Xe) confined in a C60 cage has been performed using the relativistic random phase approximation (RRPA) methodology [1]. The effects of the C60 potential modeled by a static spherical well which is reasonable in the energy region well above the C60 plasmons [2].

[1] W. R. Johnson and C. D. Lin, Phys. Rev. A 20, 964 (1979)

[2] V. K. Dolmatov, Adv. Quantum. Chem. 58, 13 (2009)