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Electron impact excitation collision strengths for neon-like Ni XIX calculated using the relativistic R-matrix method
Authors:K M Aggarwal  F P Keenan
Affiliation:(1) Department of Physics and Astronomy, Queen’s University, BT7 1NN Belfast, Northern Ireland, UK
Abstract:In a recent paper [Pramana — J. Phys. 64, 129 (2005)] results have been presented for electron impact excitation collision strengths for transitions among the fine-structure levels of the 2s22p6 and 2s22p53s configurations of Ni XIX. In this paper we demonstrate through an independent calculation with the relativistic R-matrix code that those results are unreliable and the conclusions drawn are invalid.
Keywords:Collisional excitation  Dirac atomic R-matrix code
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