EDP Sciences
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Volume 399, Number 2, February IV 2003
Page(s) 799 - 805
Section Celestial mechanics and astrometry
DOI http://dx.doi.org/10.1051/0004-6361:20021733

A&A 399, 799-805 (2003)
DOI: 10.1051/0004-6361:20021733

Effective collision strengths for transitions in Fe XI

K. M. Aggarwal and F. P. Keenan

Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland, UK
(Received 30 October 2002 / Accepted 20 November 2002 )

Collision strengths for transitions among the lowest 48 fine-structure levels belonging to the (1s 22s 22p 6) 3s 23p 4, 3s3p 5, 3s 23p 33d and 3p 6 configurations of Fe XI have been calculated using the Dirac Atomic R-matrix Code (DARC) of Norrington & Grant (2003). Results are tabulated at energies above thresholds in the range $10 \le E \le 100$ Ry, although resonances have been resolved in a fine energy mesh in the thresholds region. Effective collision strengths, obtained after integrating the collision strengths over a Maxwellian distribution of electron velocities, are also tabulated over a wide electron temperature range below $5\times 10^6$ K. Comparisons with other available results are made, and the accuracy of the present data is assessed.

Key words: atomic data -- atomic processes

Offprint request: K. M. Aggarwal, K.Aggarwal@qub.ac.uk

© ESO 2003