Atomic data from the IRON Project. XXXIV. Electron impact excitation of Fe XVI
Abstract
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 (n<= 4) 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 10(5<=) T/{K}<= 10(7) .
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- April 1999
- DOI:
- 10.1051/aas:1999466
- Bibcode:
- 1999A&AS..136..385E
- Keywords:
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- ATOMIC AND MOLECULAR DATA;
- SUN: CORONA