EDP Sciences
Free access
Volume 365, Number 2, January II 2001
Page(s) 258 - 265
Section Atomic and molecular data
DOI http://dx.doi.org/10.1051/0004-6361:20000330

A&A 365, 258-265 (2001)
DOI: 10.1051/0004-6361:20000330

Atomic data from the IRON project

XLVI. Electron excitation of $\mathsf{3s3p^6 and 3s^{2}3p^{4}3d}$ fine-structure transitions in Fe x
J. 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 $\log T({\rm K})=5.4-7.0$. 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