期刊
ASTRONOMY & ASTROPHYSICS
卷 585, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201527378
关键词
atomic data; techniques: spectroscopic; Sun: corona; line: identification
资金
- STFC (UK) through the University of Cambridge DAMTP astrophysics grant
- University of Strathclyde UK APAP network grant [ST/J000892/1]
- STFC [ST/J000892/1, ST/L000636/1, PP/E004857/2] Funding Source: UKRI
- Science and Technology Facilities Council [PP/E004857/2, ST/J000892/1, ST/L000636/1] Funding Source: researchfish
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 3s(2) 3p(5) P-2(1/2)-3s(2) 3p(4) 3d D-2(3/2) transition, which is important for density diagnostics.
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