Inner-shell photoionization of excited lithium

Abstract

Calculations of inner-shell photoionization of ${1s}^{2}2p{}^{2}{P}^{o}$ and ${1s}^{2}3p{}^{2}{P}^{o}$ Li excited states have been performed using recent developments of the R-matrix code with a 29-term target representation for incident photon energies up to 165 eV, with particular emphasis on multiple electron processes. Partial and total cross sections are given for a number of excitation processes including the lower members of 19 hollow atom resonance series. The results are compared with recent experimental measurements of the lowest ${2s2p}^{2}{}^{2}{L}^{e}$ resonance of even-parity hollow lithium states produced by photoexcitation of laser-excited lithium atoms. Experiment and theory are in excellent agreement on a relative scale. The enhancement of the shake-up process increases with initial state excitation, up to 500% over that of the ground state for ${1s}^{2}3p{}^{2}{P}^{o}.$ Good agreement is also obtained for K-shell photoionization when comparing branching ratios with available experimental results.