Abstract
An ewR-matrix calculation of rate coefficients for electron collisional excitation of Fe xiii is presented and compared to recent calculations of comparable complexity. At temperatures at which Fe 12+ is typically found in the solar corona, the present results, which use the intermediate coupling frame transformation method, show significant differences compared to some earlier work. We use a large configuration interaction calculation with extensive correlation to assess the accuracy of our and earlier workers’ scattering targets.
Highlights
The rates for electron impact excitation of Fe12+ are principally of interest for collisionally ionized gases such as the coronae of the Sun and other stars and fusion plasmas
Cross-sections for electron collisional excitation of the terms of the 3s23p2 configuration were first calculated by Czyzak et al (1967) in the distorted wave approximation, while Flower (1971) used the same method and included the additional configurations, 3s3p3 and 3s23p3d
The distorted wave method was used by Fawcett & Mason (1989), who used a limited configuration basis and the distorted wave method but used Slater parameter optimization to bring the target energies into better agreement with experiment
Summary
The rates for electron impact excitation of Fe12+ are principally of interest for collisionally ionized gases such as the coronae of the Sun and other stars and fusion plasmas. Cross-sections for electron collisional excitation of the terms of the 3s23p2 configuration were first calculated by Czyzak et al (1967) in the distorted wave approximation, while Flower (1971) used the same method and included the additional configurations, 3s3p3 and 3s23p3d. These early scattering calculations, limited by available computing resources, both in hardware and software, were unable to incorporate the significant configuration interaction in this ion, which was discussed by Flower & Nussbaumer (1974) in some detail.
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