A&A 365, 268-274 (2001)
Atomic data from the Iron Project
XLVII. Electron impact excitation of Ni IIIM. A. Bautista .
Laboratory for High Energy Astrophysics, Code 662, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
(Received 29 August 2000 / Accepted 17 October 2000)
This paper reports R-matrix calculations of electron impact excitation rates for Ni III. The calculation includes 70 LS terms corresponding to the configurations 3d8, 3d74s, 3d74p, and 3d64s2. This expansion results in 162 fine structure levels and 13 041 transitions, including optical, infrared, and ultraviolet lines. The collision strengths, including detailed resonance structures, were integrated over a Maxwellian distribution of electron energies and the resulting effective collision strengths are given for a wide range of temperatures. A collisional-radiative equilibrium model of the Ni III ion is constructed and the strongest lines in the optical and infrared spectral regions are identified. The emissivities of these lines and emissivity line ratio diagnostics are presented.
Key words: atomic data -line: formation -ISM: abundances -ultraviolet: general
Offprint request: M. A. Bautista email@example.com
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