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

Tools

Fernández-Menchero, L. and Del Zanna, G. and Badnell, N. R. (2014) R-matrix electron-impact excitation data for the Mg-like iso-electronic sequence. Astronomy and Astrophysics, 572. A115. ISSN 0004-6361 (https://doi.org/10.1051/0004-6361/201424849)

[thumbnail of Fernandez-Menchero-etal-AA-2014-R-matrix-electron-impact-excitation-data-for-the-Mg-like-iso]
Preview
 Text. Filename: Fernandez_Menchero_etal_AA_2014_R_matrix_electron_impact_excitation_data_for_the_Mg_like_iso.pdf
Accepted Author Manuscript
Download (527kB)| Preview

Abstract

Emission lines from ions in the Mg-like iso-electronic sequence can be used as reliable diagnostics of temperature and density of astrophysical and fusion plasmas over a wide range of parameters. Data in the literature are quite lacking, there are no calculations for many of the ions in the sequence. We have carried-out intermediate coupling frame transformation R-matrix calculations which include a total of 283 fine-structure levels in both the configuration interaction target and close-coupling collision expansions. These arise from the configurations 1s2 2s2 2p6 3 {s,p,d} nl with n = 4,5, and for l = 0−4. We obtain ordinary collision strengths and Maxwell-averaged effective collision strengths for the electron-impact excitation of all the ions of the Mg-like sequence, from Al+ to Zn18 +. We compare our results with those from previous R-matrix and distorted waves calculations, where available, for some benchmark ions. We find good agreement with the results of previous calculations for the transitions n = 3−3. We also find good agreement for the most intense transitions n = 3−4. These transitions are important for populating the upper levels of the main diagnostic lines.

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:54182
    Dates:
    Date
    Event
    5 December 2014
    Published
    18 September 2014
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:08 Sep 2015 07:52
    Last modified:11 Nov 2024 11:10
    URI:https://strathprints.strath.ac.uk/id/eprint/54182
CORE (COnnecting REpositories)