Journal
ASTROPHYSICAL JOURNAL
Volume 785, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/785/2/99
Keywords
atomic data; atomic processes; plasmas
Categories
Funding
- UK STFC under the UK APAP Network [ST/J000892/1]
- US Department of Energy
- STFC [ST/J000892/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000892/1] Funding Source: researchfish
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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 Fe2+, 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.
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