Electron-impact excitation of Fe<sup>2</sup>: a comparison of intermediate coupling frame transformation, Breit-Pauli and Dirac R-matrix calculations
Data(s) |
01/04/2014
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Resumo |
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$^{2+}$ 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. [Ap.J.Lett, 718, L189, (2010)] who carried-out ICFT and Dirac R-matrix calculations for the same ion. We discuss possible reasons. |
Identificador | |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
Badnell , N R & Ballance , C P 2014 , ' Electron-impact excitation of Fe 2 : a comparison of intermediate coupling frame transformation, Breit-Pauli and Dirac R-matrix calculations ' The Astrophysical Journal , vol 785 , no. 2 , 99 . DOI: 10.1088/0004-637X/785/2/99 |
Tipo |
article |