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

Research output: Contribution to journalConference Contributionpeer-review

14 Downloads (Pure)


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
Issue number5
Publication statusPublished - 7 Sep 2015
EventXXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC) - Toledo, Spain
Duration: 22 Jul 201528 Jul 2015


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

Cite this