Abstract
Calculations of the photoionization cross section of the and subshells of free Ar and Ar@ as examples have been performed using the molecular structure of the confined system and time-dependent density functional theory for the dynamical quantities. The results for in the combined system exhibit significant confinement resonances with the lower-energy ones being quite sharp, in contrast to the results of jellium-model calculations. In addition, calculations done with and without interchannel coupling between the photoionization channels of the subshell of the Ar atom and the subshell of the shell show that, in this case, the coupling is of negligible importance, even though the cross section is more than an order of magnitude larger than that of in the 300 eV range. The , which is not hybridized, also exhibits confinement resonances, but is very strongly affected by interchannel coupling with photoionization channels from the shell. The phenomenology of both and subshells is explained in terms of the interchannel-coupling matrix elements. These results should be applicable to inner-shell ionization of essentially any endohedral fullerene system.
- Received 12 May 2015
- Revised 14 July 2015
DOI:https://doi.org/10.1103/PhysRevA.92.023405
©2015 American Physical Society