Volume 585, January 2016
|Number of page(s)||8|
|Section||Atomic, molecular, and nuclear data|
|Published online||06 January 2016|
Atomic data for astrophysics: Ni XII⋆
DAMTP, Centre for Mathematical Sciences, University of
2 Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK
Received: 16 September 2015
Accepted: 5 November 2015
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.
Key words: atomic data / techniques: spectroscopic / Sun: corona / line: identification
The full dataset is available at our APAP website (www.apapnetwork.org) and at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/585/A118
© ESO, 2016
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