Completeness of the configuration interaction / close coupling expansion versus the relativistic formalism in R-matrix calculations

Fernández-Menchero, L. and Del Zanna, G. and Badnell, N. R. (2015) Completeness of the configuration interaction / close coupling expansion versus the relativistic formalism in R-matrix calculations. Journal of Physics: Conference Series, 635 (5). 052034. ISSN 1742-6588

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    Abstract

    R-matrix calculations have different sources of inaccuracy. We analyze the differences in the final results caused by differences in three aspects of the calculation: the atomic structure of the target, the completeness of the close coupling expansion, and the method used to include relativistic effects in the Hamiltonian. We present the electron-impact excitation of the ion Be-like Al9+ as a case study. We conclude that the completeness of the CI/CC expansion plays the most important role for the reliability of the results, mainly for the most highly-excited levels.