Effective collision strengths for allowed transitions among the n ≤ 5 degenerate levels of Al XIII
Abstract
Aims:In this paper we report on calculations of collision strengths and effective collision strengths for allowed transitions among the n ≤ 5 degenerate levels of Al xiii.
Methods: The Dirac atomic R-matrix code (darc) has been adopted for these calculations.
Results: Collision strengths are reported over a wide energy range below 300 Ryd, and effective collision strengths are provided for electron temperatures of 4.4 ≤ log Te ≤ 6.8 K.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 2008
- DOI:
- 10.1051/0004-6361:20078933
- Bibcode:
- 2008A&A...479..585A
- Keywords:
-
- atomic data;
- atomic processes