2008A&A...488..365A

In this paper we report electron impact collision strengths and excitation rates for transitions among the lowest 89 levels of NiXIX. The Dirac atomic R-matrix code (darc) is adopted for the calculations of collision strengths and subsequently the effective collision strengths. Collision strengths for resonance transitions among 89 levels arising from the (1s²) 2s²2p⁶, 2s²2p⁵3l, 2s2p⁶3l, 2s²2p⁵4l, and 2s2p⁶4l configurations of NiXIX are reported over a wide energy range below 250Ryd. Additionally, effective collision strengths for all 3916 transitions among the 89 levels are listed over a wide temperature range below 10⁷K. Comparisons are made among different calculations and the accuracy of the data is assessed. Finally, comparisons between theoretical and experimental intensity ratios of some prominent lines of NiXIX are discussed.