2010A&A...518A..64L


Query : 2010A&A...518A..64L

2010A&A...518A..64L - Astronomy and Astrophysics, volume 518, A64-64 (2010/7-2)

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

LIANG G.Y. and BADNELL N.R.

Abstract (from CDS):

We present results for the electron-impact excitation of all Ne-like ions from Na+ to Kr26+ obtained using the intermediate-coupling frame transformation R-matrix approach. For each ion's calculation, the close-coupling expansion is taken to be the 113 LS terms (209 levels) belonging to the configurations [1s2]2s22p6, 2s22p5{3,4,5}l, 2s2p6{3,4,5}l (l∈s, p, d, f, and g), and 2s22p5{6,7}l' (l'∈s, p, and d). An additional configuration interaction effect arising from configurations of 2s22p43l{3,4,5}l'' (l''∈ s, p, d, f and g) was included in the target expansion. A detailed comparison of the target structure has been made for six specific ions (Si4+, Ar8+, Ca10+, Fe16+, Ni18+, and Kr26+) spanning the sequence to assess the accuracy for the entire sequence. Effective collision strengths (Υs) are presented at temperatures ranging from 2x102(q+1)2K to 2x106(q+1)2K (where q is the residual charge of ions, i.e. Z-10). Detailed comparisons for the Υs are made with the results of previous calculations for several ions, which span the sequence. Furthermore, we examine the iso-electronic trends of effective collision strengths as a function of temperature. The present results are the only R-matrix ones for the majority of the ions and the most extensive and complete data for modelling to-date.

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Journal keyword(s): atomic data - atomic processes - plasmas

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2023.01.31-02:19:54

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