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Issue A&A Volume 500, Number 3, June IV 2009 Page(s) 1263 - 1269 Section Atomic, molecular, and nuclear data DOI 10.1051/0004-6361/200911866 Published online 08 April 2009

A&A 500, 1263-1269 (2009)
DOI: 10.1051/0004-6361/200911866

R-matrix electron-impact excitation data for the Na-like iso-electronic sequence

G. Y. Liang, A. D. Whiteford, and N. R. Badnell

Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK
    e-mail: guiyun.liang@strath.ac.uk

Received 17 February 2009 / Accepted 26 March 2009

Abstract
We present results for the outer-shell electron-impact excitation of all Na-like ions from Mg⁺ to Kr²⁵⁺ obtained using the intermediate-coupling frame transformation R-matrix approach. For each ion's calculation, the target and close-coupling expansions are both taken to be the 18 LS terms (32 levels) belonging to configurations [1s²2s²2p⁶] 3l, 4l, 5l and 6l (l = 0-5). Effective collision strengths (s) are presented at temperatures ranging from 210²(q+1)² K to 210⁶(q+1)² K (where q is the residual charge of ions, i.e. Z-11). Detailed comparisons for the s are made with the results of previous calculations for several ions, which span the sequence. Furthermore, we examine the iso-electronic trends of both low- and high-temperature effective collision strengths

Key words: atomic data -- atomic processes -- plasmas

© ESO 2009

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