Completeness of the Configuration Interaction / Close Coupling expansion versus the relativistic formalism in R-matrix calculations

29th International Conference on Photonic, Electronic, and Atomic Collisions

Fernández-Menchero, L.^1 ; Del Zanna, G.^2 ; Badnell, N.R.^1

Department of Physics, University of Strathclyde, Glasgow

G4 0NG, United Kingdom^1

Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge

CB3 0WA, United Kingdom^2

关键词: Close coupling;    Configuration interactions;    Electron-impact excitation;    Excited levels;    R-matrix calculation;    Relativistic effects;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/5/052034/pdf
DOI  :  10.1088/1742-6596/635/5/052034

来源: IOP

【 摘 要 】

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.