Atomic data for astrophysics : Ni XII
Del Zanna, G. and Badnell, N. R. (2016) Atomic data for astrophysics : Ni XII. Astronomy and Astrophysics, 585. A118. ISSN 0004-6361 (https://doi.org/10.1051/0004-6361/201527378)
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Abstract
We present new large-scale R-matrix (up to n = 4) scattering calculations for the electron collisional excitation of Cl-like Ni xii. We used the intermediate-coupling frame transformation method. We compare predicted and observed line intensities using laboratory and solar spectra, finding good agreement for all the main soft X-ray lines. With the exception of the three strongest transitions, large discrepancies with previous estimates are found, especially for the decays from the lowest 3s2 3p4 3d levels. This includes the forbidden UV lines. The atomic data for the n = 4 levels are the first to be calculated. We revise previous experimental energies, and suggest several new identifications. We point out the uncertainty in the wavelength of the 3s2 3p52P1/2-3s2 3p4 3d 2D3/2 transition, which is important for density diagnostics.
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Item type: Article ID code: 55980 Dates: DateEvent6 January 2016Published5 November 2015AcceptedNotes: © ESO, 2016 Subjects: Science > Astronomy Department: University of Strathclyde > University of Strathclyde Depositing user: Pure Administrator Date deposited: 22 Mar 2016 13:03 Last modified: 15 Aug 2024 00:45 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/55980