Forbidden transitions in Li-like ions: Compact effective collision strengths for ${\rm 2s} - n{\rm s},n{\rm d}$ where $n = 3,\, 4,\, 5$

Autor:	M. C. Chidichimo, J. A. Tully, A. Burgess
Rok vydání:	1998
Předmět:	Physics Electron excitation General Physics and Astronomy Atomic physics Table (information) Collision Atomic data Ion
Zdroj:	Astronomy and Astrophysics Supplement Series. 131:145-152
ISSN:	1286-4846 0365-0138
DOI:	10.1051/aas:1998258
Popis:	Using an extension of the method for compact- ing atomic data set out by Burgess & Tully (1992), we make concise ts to a selection of the set of collision strengths given by Zhang et al. (1990) for Li-like ions from O +5 to U +89 . We carry out thermal averaging and t the resulting eective collision strengths . A compact 5 5o r 44 table of cardinal values for each transition allows one to reproduce the T and Z dependent to bet- ter than 1 per cent. The present study is for the forbidden transitions 2s! 3s; 4s; 5s and 2s! 3d; 4d; 5d.
Databáze:	OpenAIRE
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