Abstract
We present results for the electronimpact excitation of all Nelike ions from Na+ to Kr26+ obtained using the intermediatecoupling frame transformation Rmatrix approach. For each ion's calculation, the closecoupling 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. Z10). Detailed comparisons for the.s are made with the results of previous calculations for several ions, which span the sequence. Furthermore, we examine the isoelectronic trends of effective collision strengths as a function of temperature. The present results are the only Rmatrix ones for the majority of the ions and the most extensive and complete data for modelling todate.
Original language  English 

Number of pages  20 
Journal  Astronomy and Astrophysics 
Volume  518 
Issue number  July/August 
DOIs  
Publication status  Published  3 Sept 2010 
Keywords
 atomic data
 atomic processes
 plasmas
 collision strengths
 FEXVII
 energylevels
 breitpauli
 NIXIX
 laboratory measurements
 rate coefficients
 radiative rates
 emissionlines
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Data for: "Rmatrix electronimpact excitation data for the Nelike isoelectronic sequence." (Nalike isoelectronic sequence. II. : J/A+A/518/A64)
Liang, G. Y. (Creator) & Badnell, N. (Creator), Centre de Donnees Strasbourg (CDS), 16 Jan 2023
DOI: 10.26093/cds/vizier.35180064
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