Atomic Data from the Iron Project LXVI. Fe18+ (Butler+,

Details Atomic Data from the Iron Project LXVI. Fe18+ (Butler+, Atomic Data from the Iron Project LXVI. Fe18+ (Butler+,

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..34891369b&link_type=abstract

VizieR On-line Data Catalog: J/A+A/489/1369. Originally published in: 2008A&A...489.1369B

Physics

Atomic Physics

Atomic Physics

Scientific paper

Accurate electron collisional data are required for the analysis of the Fe XIX astrophysical spectrum, in particular in the Sun. Such an analysis can provide information on the physical characteristics of the coronal plasma.
An extensive target is used in an R-matrix scattering calculation to provide the necessary data for Fe18+. The use of the R-matrix method includes the resonance contribution lacking in the distorted wave approach and the large target improves the accuracy of the close-coupling approximation.
The R-Matrix package described by Berrington et al. (1995) as provided by the UK RmaX project has been used to calculate electron collisional data among 342 levels of Fe18+. We have used the intermediate-coupling frame-transformation (ICFT) method (Griffin et al., 1998) to transform data obtained in a 166 term LS-coupling calculation. Contributions from the mass and Darwin interactions have also been included in the Hamiltonian.
Collision strengths for all transitions between the 342 levels of Fe18+ are presented. They are tabulated over a wide range of electron temperatures of astrophysical interest. The results are compared with the earlier Iron Project work of Butler & Zeippen (2001, Cat. ) and also with that of McLaughlin et al. (2001MNRAS.328..442M) and Landi & Gu (2006ApJ...640.1171L). The agreement is reasonable for the low-lying transitions. Larger differences are found for the more highly excited states.
The file structure is described in detail in
http://www.adas.ac.uk/man/appxa-04.pdf
A sample program to extract a single upsilon is provided.
(3 data files).

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