Forbidden transitions in Li-like ions: Compact effective collision strengths for where *
Department of Applied Mathematics and Theoretical Physics, Silver Street, Cambridge CB3 9EW, UK
2 Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
3 Département G.D. Cassini, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France e-mail: email@example.com
Accepted: 2 January 1998
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 given by Zhang et al. (1990) for Li-like ions from O+5 to U+89. We carry out thermal averaging and fit the resulting effective collision strengths . A compact or table of cardinal values for each transition allows one to reproduce the T and Z dependent to better than 1 per cent. The present study is for the forbidden transitions and .
Key words: Li-like ions / electron excitation / compact atomic data
© European Southern Observatory (ESO), 1998