Forbidden transitions in Li-like ions: Compact effective collision strengths for 2s-ns, nd where n=3, 4, 5

被引：5
|
作者：
Burgess, A
Chidichimo, MC
Tully, JA
机构：
[1] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 9EW, England
[2] Univ Waterloo, Dept Appl Math, Waterloo, ON N2L 3G1, Canada
[3] Observ Cote Azur, Dept GD Cassini, F-06304 Nice, France
来源：
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES | 1998年 / 131卷 / 01期
关键词：
Li-like ions; electron excitation; compact atomic data;
D O I：
10.1051/aas:1998258
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Using an extension of the method for compacting atomic data set out by Burgess & Tully (1992), we make concise fits to a selection of the set of collision strengths Omega given by Zhang et al. (1990) far Li-like ions from O+5 to U+89. We carry out thermal averaging and fit the resulting effective collision strengths Upsilon. A compact 5 x 5 or 4 x 4 table of cardinal values for each transition allows one to reproduce the T and Z dependent Upsilon to better than 1 per cent. The present study is for the forbidden transitions 2s --> 3s, 4s, 5s and 2s --> 3d, 4d, 5d.
引用
收藏
页码：145 / 152
页数：8
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