Abstract
The multipole rate coefficients \(C^K\) 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 \(C^K\) for transitions between fine-structure levels of the Si-like ion Fe XIII in the temperature range \((0.7-5)\times 10^6\) K. Selected results for transitions within the \(3s^23p^2\) ground configuration and from \(3s^23p^2\) to \(3s^23p3d\) 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 \(C^K\), we need the multipole collision strengths \(\varOmega ^K\) 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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This manuscript has no associated data or the data will not be deposited. [Author’s comment: All data produced and discussed in the study are included in this published article. Any other data can be provided upon suitable request.]
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Acknowledgements
M.K.I. would like to express his thanks and gratitude to Annarita Laricchiuta (Chair 12th ICAMDATA) for assistance in his participation to the Conference. We thank Meryem Belabbas for interest expressed in the early stages of this work.
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AFS-H performed the numerical calculations and plotted the figures under the supervision of MKI. MKI and MB analyzed and discussed the results, and wrote the manuscript. All authors approved the final manuscript.
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Sekkal-Haddouche, A.F., Inal, M.K. & Benmouna, M. Multipole rate coefficients for collisional excitation of Fe XIII by isotropic electrons. Eur. Phys. J. D 77, 148 (2023). https://doi.org/10.1140/epjd/s10053-023-00734-1
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DOI: https://doi.org/10.1140/epjd/s10053-023-00734-1