Astron. Astrophys. Suppl. Ser. 136, 385-394
W. Eissner1 - M.E. Galavís2,4 - C. Mendoza3,4 - C.J. Zeippen4
Send offprint request: C.J. Zeippen
1 - Lehrstuhl für Theoretische Physik I, Ruhr-Universität,
D-44780 Bochum, Germany
2 -
Departamento de Física, Universidad Metropolitana, PO Box
76819, Caracas 1070A, Venezuela
3 - Centro de Física, Instituto
Venezolano de Investigaciones Científicas (IVIC), PO Box 21827, Caracas
1020A, Venezuela
4 - UMR 8631 (associée au CNRS et à l'Université
Paris 7) et DAEC, Observatoire de Paris, F-92195 Meudon, France
Received September 25; accepted November 18, 1998
As part of the IRON Project, electron impact excitation effective collision strengths are computed for the ion Fe XVI familiar in solar spectra. A Breit-Pauli R-matrix calculation is performed with a 12-level ()target representation. The calculation for this relatively simple ion is approached as a test case where we can analyze in detail most of the effects that contribute to the accuracy of the collision strengths: the energy mesh, relativistic corrections, the asymptotic multipole potentials and contributions from high partial waves. By comparing with two recent independent calculations, an accuracy rating of 10% is assigned to the present effective collision strengths in the electron-temperature range of .
Key words: atomic and molecular data -- sun: corona
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