Benchmarking dielectronic recombination rate coefficients for carbon-like Ca 14+

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Zhang, C. Y. and Yan, B. S. and Wang, K. and Si, R. and Yao, K. and Ma, W. L. and Huang, Z. K. and Wen, W. Q. and Ma, X. W. and Zhu, L. F. and Chen, C. Y. and Badnell, N. R. (2024) Benchmarking dielectronic recombination rate coefficients for carbon-like Ca 14+. The Astrophysical Journal, 976 (1). 84. ISSN 1538-4357 (https://doi.org/10.3847/1538-4357/ad812b)

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Abstract

Dielectronic recombination (DR) rate coefficients for C-like Ca14+ were measured by Wen et al. at the electron cooler storage ring in Lanzhou, China. The measured DR rate coefficients from 0 to 92 eV cover most of the DR resonances associated with the 2s 22p 2 → 2s 22p 2 and 2s 22p 2 → 2s2p 3 core transitions. In addition, Wen et al. reported theoretical results calculated with the Flexible Atomic Code (FAC) and AUTOSTRUCTURE (AS). However, these theoretical results show widespread and significant differences from the measured DR spectrum in both resonance energies and strengths, as well as between each other. In the present work, we uncover the reasons behind these large differences, both theoretical and experimental. The new FAC and AS results reproduce the observed spectrum in detail, especially at resonance energies below 8 eV, and they are in very close agreement with each other. The present plasma rate coefficients agree with the experimentally determined values to within 20% and 2% in the photoionized plasma (PP) and collisional ionized plasma (CP) temperature ranges, respectively. This is in contrast to the previous theoretical results, which showed differences with the experiment of up to ∼40% over the PP temperature range. The present FAC and AS results agree with each other within 5% in the PP and CP temperature ranges. Thus, the theoretical uncertainty is greatly reduced for the DR of Ca14+ and the present benchmarking with the experiment gives confidence to data users modeling non–local thermodynamic equilibrium plasma.

ORCID iDs

Zhang, C. Y. ORCID logoORCID: https://orcid.org/0000-0003-1935-6907, Yan, B. S., Wang, K., Si, R., Yao, K., Ma, W. L., Huang, Z. K., Wen, W. Q., Ma, X. W., Zhu, L. F., Chen, C. Y. and Badnell, N. R. ORCID logoORCID: https://orcid.org/0000-0001-7418-7996;
  • Item type:Article
    ID code:91188
    Dates:
    Date
    Event
    14 November 2024
    Published
    26 September 2024
    Accepted
    27 February 2024
    Submitted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:18 Nov 2024 14:00
    Last modified:29 Dec 2024 01:31
    URI:https://strathprints.strath.ac.uk/id/eprint/91188
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