Calculation of the photoionization with de-excitation cross sections of He and helium-like ions

摘要

We discuss the results of the calculation of the photoionization withde-excitation of excited He and helium-like ions Li$^{+}$ and B$^{3+}$ at highbut non-relativistic photon energies $\omega $. Several lower $^{1}S$ and$^{3}S$ states are considered. We present and analyze the ratios$R_{d}^{+\ast}$ of the cross sections of photoionization with de-excitation,$\sigma_{(d)}^{+\ast}(\omega)$, and of the photo-ionization with excitation,$\sigma ^{+\ast}(\omega)$. The dependence of $R_{d}^{+\ast}$ on the excitationof the target object and the charge of its nucleus is presented. Apart totheoretical interest, results obtained can be verified using such long livingexcited state as $2^{3}S$ of He.