Volume 567, July 2014
|Number of page(s)||7|
|Section||Atomic, molecular, and nuclear data|
|Published online||04 July 2014|
Atomic data for astrophysics: Ni XV⋆
DAMTP, Centre for Mathematical Sciences, Wilberforce Road,
2 Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
Received: 28 February 2014
Accepted: 30 April 2014
We present the first R-matrix scattering calculation for electron collisional excitation of Ni xv. The large-scale target includes configurations up to n = 4. The calculations were carried out using the intermediate-coupling frame transformation method. Significant enhancements in the collision strengths, compared to previous distorted-wave (DW) calculations, are found for several cases, in particular the forbidden lines within the ground configuration and the 3s2 3p 4s levels. We provide a complete set of rates and a list of strongest lines that are observable in astrophysical plasmas. Previous identifications are reviewed, and a few new ones suggested. The new data can be used to accurately measure electron densities for high-temperature (3 MK) plasmas, and the nickel abundance.
Key words: atomic data / line: identification / techniques: spectroscopic / Sun: corona
The full dataset (energies, transition probabilities and rates) is available from our APAP website http://www.apap-network.org, and also at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/567/A18
© ESO, 2014
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