Abstract
It is shown that the cross sections for electron-impact excitation of highly charged ions are strongly influenced by relativistic effects as well as radiation damping of autoionizing resonances. Both effects are incorporated in an ab initio manner within the close coupling formulation using the R-matrix method, the relativistic effects through the Breit-Pauli approximation, and radiation damping using the Bell and Seaton theory (1985) of dielectronic recombination. Implications for large-scale electron-ion scattering calculations and for astrophysical and laboratory plasma diagnostics are pointed out. Results are presented for transitions in boron-like Fe XXII and helium-like Fe XXV. The Fe XXV cross sections are in good agreement with recent experimental measurements.
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