A&A 365, 258-265 (2001)
Atomic data from the IRON project
XLVI. Electron excitation of fine-structure transitions in Fe xJ. C. Pelan1 and K. A. Berrington2 .
1 Gatsby Computational Neuroscience Unit, University College, 17 Queen Square, London WC1N 3AR, UK
2 School of Science & Mathematics, Sheffield Hallam University, Sheffield S1 1WB, UK
(Received 21 July 2000 / Accepted 2 October 2000 )
Electron excitation collision strengths for fine-structure transitions 3s23p5-3s3p6, 3s23p5-3s23p43d and 3s3p6-3s23p43d in Fe X, are calculated using a 180-level Breit-Pauli R-matrix calculation containing the above levels together with those from 3s3p53d and 3s23p33d2 configurations. The collision strength is averaged over a Maxwellian velocity distribution to obtain the effective fine-structure collision strengths as a function of electron temperature from . We show that low-energy resonances enhance the effective collision strength, with significant effects on level populations.
Key words: atomic data
Offprint request: K. A. Berrington
© ESO 2001