NiXIX effective collision strengths

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 (1s^2^) 2s^2^2p^6^, 2s^2^2p^5^3l, 2s2p^6^3l, 2s^2^2p^5^4l, and 2s2p^6^4l 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 10^7^K. 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.