Picture of two heads

Open Access research that challenges the mind...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

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. Astronomy and Astrophysics, 518 (July/A). ISSN 0004-6361

Full text not available in this repository. (Request a copy from the Strathclyde author)

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.