Atomic data from the IRON project LX.: Electron-impact excitation of n=3, 4 levels of Fe17+

被引：23

作者：

Witthoeft, MC ^{[1
]}

Badnell, NR

Del Zanna, G

Berrington, KA

Pelan, JC

机构：

[1] Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland

[2] UCL, MSSL, Dorking RH5 6NT, Surrey, England

[3] Sheffield Hallam Univ, Sch Sci & Math, Sheffield S1 1WB, S Yorkshire, England

[4] UCL, Gatsby Computat Neurosci Unit, London WC1N 3AR, England

来源：

ASTRONOMY & ASTROPHYSICS | 2006年 / 446卷 / 01期

关键词：

atomic data; atomic processes;

D O I：

10.1051/0004-6361:20053631

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results for electron-impact excitation of F-like Fe calculated using R-matrix theory where an intermediate-coupling frame transformation (ICFT) is used to obtain level-resolved collision strengths. Two such calculations are performed, the first expands the target using 2s(2) 2p(5), 2s 2p(6), 2s2 2p(4)3l, 2s 2p(5)3l, and 2p(6)3l configurations while the second calculation includes the 2s(2) 2p(4)4l, 2s 2p(5)4l, and 2p(6)4l configurations as well. The effect of the additional structure in the latter calculation on the n = 3 resonances is explored and compared with previous calculations. We find strong resonant enhancement of the effective collision strengths to the 2s(2) 2p(4) 3s levels. A comparison with a Chandra X-ray observation of Capella shows that the n = 4 R-matrix calculation leads to good agreement with observation.

引用

页码：361 / 366

页数：6

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