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

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

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...518a..64l&link_type=abstract

Astronomy and Astrophysics, Volume 518, id.A64

Astronomy and Astrophysics

Astrophysics

7

Atomic Data, Atomic Processes, Plasmas

Scientific paper

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 2 × 102(q+1)2 K to 2 × 106(q + 1)2 K (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.
These data are made available in the archives of APAP via http://www.apap-network.org, OPEN-ADAS via http://open.adas.ac.uk as well as anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/518/A64

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