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

页码：145 / 152

页数：8