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

Liang, G. Y. and Badnell, N. R. (2010) R-matrix electron-impact excitation data for the Ne-like iso-electronic sequence. Experimental Astronomy, 518 (July/August). -. ISSN 0922-6435

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Abstract

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 [1s(2)]2s(2)2p(6), 2s(2)2p(5){3, 4, 5}l, 2s2p(6){3, 4, 5}l (l is an element of s, p, d, f, and g), and 2s(2)2p(5){6, 7} l' (l' is an element of s, p, and d). An additional configuration interaction effect arising from configurations of 2s(2)2p(4)3l{3, 4, 5}l" (l" is an element of 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 (Gamma s) are presented at temperatures ranging from 2x10(2)(q+1)(2) K to 2x10(6)(q+1)(2) K (where q is the residual charge of ions, i. e. Z-10). 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 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.

Item type: Article
ID code: 28926
Keywords: atomic data, atomic processes, plasmas, collision strengths, FE-XVII, energy-levels, breit-pauli, NI-XIX, laboratory measurements, rate coefficients, radiative rates, emission-lines, Astronomy, Physics, Astronomy and Astrophysics, Space and Planetary Science
Subjects: Science > Astronomy
Science > Physics
Department: Faculty of Science > Physics
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 28 Mar 2011 10:20
Last modified: 27 Mar 2014 09:11
URI: http://strathprints.strath.ac.uk/id/eprint/28926

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