Atomic data for the x-ray lines of Fe viii and Fe ix

O'Dwyer, B. and Del Zanna, G. and Badnell, N. R. and Mason, H.E. and Storey, P. J. (2012) Atomic data for the x-ray lines of Fe viii and Fe ix. Astronomy and Astrophysics, 537. A22. ISSN 0004-6361 (https://doi.org/10.1051/0004-6361/201117926)

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Abstract

The distorted wave extension of the autostructure code has been used to calculate energy levels, radiative transition probabilities and collisional excitation rates of Fe  viii and Fe  ix up to n = 6 for Fe ix and n = 7 for Fe  viii. We have compared some of the data with previous calculations, finding overall agreement for radiative transition rates, but interesting differences for some collisional data. We have merged our data for the higher energy levels with published R-matrix collisional excitation rates for the lower ones to calculate spectral line intensities and compare them with observations. In particular, we have focused on the transitions from high energy levels of Fe viii & Fe ix which are present in the 93–95 Å region. A few new identifications are tentatively provided. We find that Fe  ix 5f–3d and Fe  viii 7f–3d transitions only comprise a small fraction of the observed lines in the 93–95 Å region for quiet Sun conditions, and thus their contribution to the Solar Dynamics Observatory (SDO) Atmospheric Imaging Assembly (AIA) 94 Å band is expected to be small.

ORCID iDs

O'Dwyer, B., Del Zanna, G., Badnell, N. R. ORCID logoORCID: https://orcid.org/0000-0001-7418-7996, Mason, H.E. and Storey, P. J.;
  • Item type:Article
    ID code:56517
    Dates:
    Date
    Event
    1 January 2012
    Published
    Notes:Reproduced with permission from Astronomy & Astrophysics, © ESO 2012
    Subjects:Science > Physics
    Science > Astronomy
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:25 May 2016 14:39
    Last modified:11 Nov 2024 11:22
    URI:https://strathprints.strath.ac.uk/id/eprint/56517
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