Atomic data for the astrophysics : Fe XII soft X-ray lines.
Del Zanna, G. and Storey, P. J. and Badnell, N. R. and Mason, H.E. (2012) Atomic data for the astrophysics : Fe XII soft X-ray lines. Astronomy and Astrophysics, 543. A139. ISSN 0004-6361
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Abstract
We present new large-scale R-matrix (up to n = 4) and distorted-wave (DW, up to n = 6) scattering calculations for electron collisional excitation of Fe xii. The first aim is to provide accurate atomic data for the soft X-rays, where strong decays from the n = 4 levels are present. As found in previous work on Fe x, resonances attached to n = 4 levels increase the cross-sections for excitations from the ground state to some n = 4 levels, when compared to DW calculations. Cascading from higher levels is also important. We provide a number of models and line intensities, and list a number of strong unidentified lines. The second aim is to assess the effects of the large R-matrix calculation on the n = 3 transitions. Compared to our previous (n = 3) R-matrix calculation, we find overall excellent agreement to within a few percent, however a few key density diagnostic EUV intensities differ by about 60% at coronal densities. The new atomic data result in lower electron densities, resolving previous discrepancies with solar observations.
Creators(s): |
Del Zanna, G., Storey, P. J., Badnell, N. R. ![]() | Item type: | Article |
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ID code: | 56990 |
Notes: | Reproduced with permission from Astronomy & Astrophysics, © ESO |
Keywords: | atomic data, identification line, spectroscopic techniques, sun, corona, Fe xii, electron collisional excitation, coronal densities, extreme ultraviolet lines, Physics, Astronomy and Astrophysics, Space and Planetary Science |
Subjects: | Science > Physics |
Department: | Faculty of Science > Physics |
Depositing user: | Pure Administrator |
Date deposited: | 19 Jul 2016 15:24 |
Last modified: | 21 Jan 2021 00:01 |
Related URLs: | |
URI: | https://strathprints.strath.ac.uk/id/eprint/56990 |
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