Effective collision strengths for transitions in Fe XI

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Atomic Data, Atomic Processes

Scientific paper

Collision strengths for transitions among the lowest 48 fine-structure levels belonging to the (1s22s22p6) 3s23p4, 3s3p5, 3s23p33d and 3p6 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 <=E <=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 5x 106 K. Comparisons with other available results are made, and the accuracy of the present data is assessed.
Tables 2 and 3 are only available in electronic form at http://www.edpsciences.org

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