R-matrix electron-impact excitation data for the Be-like iso-electronic sequence

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Fernández-Menchero, L. and Del Zanna, G. and Badnell, N.R. (2014) R-matrix electron-impact excitation data for the Be-like iso-electronic sequence. Astronomy and Astrophysics, 566. A104. ISSN 0004-6361 (https://doi.org/10.1051/0004-6361/201423864)

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Abstract

Aims. Emission lines from ions in the Be-like isoelectronic sequence can be used for reliable diagnostics of temperature and density of astrophysical and fusion plasmas over a wide range of temperatures. Surprisingly, interpolated data is all that is available for a number of astrophysically important ions. Methods. We have carried out intermediate coupling frame transformation R-matrix calculations which include a total of 238 fine-structure levels in both the configuration interaction target and close-coupling collision expansions. These arise from the configurations 1s2 2 {s, p} nl with n = 3−7, and l = 0−4 for n ≤ 5 and l = 0−2 for n = 6,7. Results. We obtain ordinary collision strengths and Maxwell-averaged effective collision strengths for the electron-impact excitation of all the ions of the Be-like sequence, from B+ to Zn26+. We compare with previous R-matrix calculations and interpolated values for some benchmark ions. We find good agreement for transitions n = 2−2 with previous R-matrix calculations but some disagreements with interpolated values. We also find good agreement for the most intense transitions n = 2−3 which contribute via cascade to the (n = 2) diagnostic radiating levels.

ORCID iDs

Fernández-Menchero, L., Del Zanna, G. and Badnell, N.R. ORCID logoORCID: https://orcid.org/0000-0001-7418-7996;
  • Item type:Article
    ID code:51190
    Dates:
    Date
    Event
    2014
    Published
    23 June 2014
    Published Online
    15 May 2014
    Accepted
    Subjects:Science > Astronomy
    Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:21 Jan 2015 11:33
    Last modified:11 Nov 2024 10:56
    URI:https://strathprints.strath.ac.uk/id/eprint/51190
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