https://doi.org/10.1140/epjd/s10053-023-00734-1
Regular Article – Atomic Physics
Multipole rate coefficients for collisional excitation of Fe XIII by isotropic electrons
Department of Physics, Faculty of Sciences, University of Tlemcen, 13000, Tlemcen, Algeria
b
mokhtar.inal@univ-tlemcen.dz
Received:
8
June
2023
Accepted:
10
July
2023
Published online:
28
July
2023
The multipole rate coefficients 
for excitation of highly charged ions by impact with isotropic electrons are required in the analysis of intensity and polarization of line emission from hot plasmas exposed to anisotropic external radiation. Assuming a Maxwellian electron energy distribution, we calculate for transitions between fine-structure levels of the Si-like ion Fe XIII in the temperature range 
K. Selected results for transitions within the 
ground configuration and from to 
levels are given. These transitions are of interest in solar corona diagnostics based on the infrared forbidden lines at 1074.7 and 1079.8 nm and extreme ultraviolet optically-allowed lines at 202.0 and 203.8 Å. To obtain , we need the multipole collision strengths 
which we calculate in a wide range of electron energy in the relativistic distorted-wave approximation, using a modified version of the excitation program of the Flexible Atomic Code.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
