Effective collision strengths for transitions in Fe XI

Francis Keenan, Kanti Aggarwal

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Collision strengths for transitions among the lowest 48 fine- structure levels belonging to the (1s(2)2s(2)2p(6)) 3s(2)3p(4), 3s3p(5), 3s(2)3p(3)3d 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 less than or equal to E less than or equal to 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 x 10(6) K. Comparisons with other available results are made, and the accuracy of the present data is assessed.
Original languageEnglish
Pages (from-to)799-805
Number of pages7
JournalAstronomy and Astrophysics
Issue number2
Publication statusPublished - Feb 2003

ASJC Scopus subject areas

  • Space and Planetary Science


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