Atomic data and density diagnostics for S IV.

Del Zanna, G. and Badnell, N. R. (2016) Atomic data and density diagnostics for S IV. Monthly Notices of the Royal Astronomical Society, 456 (4). pp. 3720-3728. ISSN 0035-8711 (https://doi.org/10.1093/mnras/stv2845)

[thumbnail of Del-Zanna-MNRAS2016-Atomic-data-and-density-diagnostics-for-S-IV]
Preview
 Text. Filename: Del_Zanna_MNRAS2016_Atomic_data_and_density_diagnostics_for_S_IV.pdf
Final Published Version
Download (439kB)| Preview

Abstract

We present a new large-scale R-matrix scattering calculation for S iv. We used the intermediate-coupling frame transformation method and applied term energy corrections. Our calculation has a much larger configuration-interaction (CI) and close-coupling (CC) expansion than previous calculations. Despite that, we find good agreement in the predicted intensities of the decays from the three 3s 3p2 4P levels around 1400 Å, important for density diagnostics. A discrepancy between the observed and predicted intensity of the 1404.8 Å line, which is known to be blended at least with an O iv transition, is still present. Significant differences compared to previous models are found instead for the 1062.7 and 1073.0 Å lines, useful for diagnostics in low density plasma such as in nebulae. Several other significant differences were also found, concerning the population of the 3s 3p 3d 4F9/2 metastable level, and the intensities of several transitions.

  • Item type:Article
    ID code:58256
    Dates:
    Date
    Event
    11 March 2016
    Published
    14 January 2016
    Published Online
    2 December 2015
    Accepted
    Notes:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
    Subjects:Science > Physics
    Science > Astronomy
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:26 Oct 2016 08:33
    Last modified:08 Apr 2024 23:14
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/58256
CORE (COnnecting REpositories)