Abstract
Starting from the Hartree-Slater independent electron model, we perform configuration interaction (CI) calculations for both the initial state and the final state in atomic photoionization processes. Our CI K-shell photoionization cross section for Ne displays an enhancement near the threshold due to the dynamical screening effect of the K vacancy, which is in good agreement with experiments. Furthermore, the K-shell ratio function of the CI Ne K shell to the CI ${\mathrm{Ne}}^{+}$ K-shell photoionization cross sections shows no oscillatory behavior, in contrast to the ratio in the Hartree-Slater independent electron calculation.
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