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Title: Electron-impact excitation of Fe{sup 2+}: A comparison of intermediate coupling frame transformation, Breit-Pauli and Dirac R-matrix calculations

Modeling the spectral emission of low-charge iron group ions enables the diagnostic determination of the local physical conditions of many cool plasma environments such as those found in H II regions, planetary nebulae, active galactic nuclei, etc. Electron-impact excitation drives the population of the emitting levels and, hence, their emissivities. By carrying-out Breit-Pauli and intermediate coupling frame transformation (ICFT) R-matrix calculations for the electron-impact excitation of Fe{sup 2+}, which both use the exact same atomic structure and the same close-coupling expansion, we demonstrate the validity of the application of the powerful ICFT method to low-charge iron group ions. This is in contradiction to the finding of Bautista et al., who carried-out ICFT and Dirac R-matrix calculations for the same ion. We discuss possible reasons.
Authors:
 [1] ;  [2]
  1. Department of Physics, University of Strathclyde, Glasgow, G4 0NG (United Kingdom)
  2. Department of Physics, Auburn University, Auburn, AL 36849-5311 (United States)
Publication Date:
OSTI Identifier:
22357121
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 785; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BREIT-WIGNER FORMULA; COMPARATIVE EVALUATIONS; DIRAC APPROXIMATION; DIRAC EQUATION; ELECTRONS; EMISSION; EMISSIVITY; EXCITATION; EXPANSION; GALAXY NUCLEI; INTERMEDIATE COUPLING; IRON; IRON IONS; PLANETARY NEBULAE; PLASMA; R MATRIX; SIMULATION; TRANSFORMATIONS