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

L. Fernández-Menchero, G. Del Zanna, N. R. Badnell

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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.

Original languageEnglish
Article number052034
Number of pages1
JournalJournal of Physics: Conference Series
Volume635
Issue number5
DOIs
Publication statusPublished - 7 Sep 2015
EventXXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC) - Toledo, Spain
Duration: 22 Jul 201528 Jul 2015

Keywords

  • atoms
  • electron resonance
  • impact ionization
  • close coupling
  • configuration interactions
  • electron-impact excitation
  • excited levels
  • R-matrix calculation
  • relativistic effects
  • electric excitation

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