Configuration Interaction Effects in Unresolved 5p65dN+1−5p55dN+2+5p65dN5f1 Transition Arrays in Ions Z = 79–92

Abstract

Configuration interaction (CI) effects can greatly influence the way in which extreme ultraviolet (EUV) and soft X-ray (SXR) spectra of heavier ions are dominated by emission from unresolved transition arrays (UTAs), the most intense of which originate from ∆n = 0, 4p 6 4d N+1 −4p 5 4d N+2 +4p 6 4d N 4f 1 transitions. Changing the principle quantum number n, from 4 to 5, changes the origin of the UTA from ∆n = 0, 4p 6 4d N+1 −4p 5 4d N+2 +4p 6 4d N 4f 1 to ∆n = 0, 5p 6 5d N+1 −5p 5 5d N+2 +5p 6 5d N 5f 1 transitions. This causes unexpected and significant changes in the impact of configuration interaction from that observed in the heavily studied n = 4−n = 4 arrays. In this study, the properties of n = 5−n = 5 arrays have been investigated theoretically with the aid of Hartree-Fock with configuration interaction (HFCI) calculations. In addition to predicting the wavelengths and spectral details of the anticipated features, the calculations show that the effects of configuration interaction are quite different for the two different families of ∆n = 0 transitions, a conclusion which is reinforced by comparison with experimental results.

An Investigation of Laser Produced Lead-Tin Alloy Plasmas between 10 and 18 nm

“…Liu et al previously showed that the effect of CI on the 5d-5f and 5p-5d emission arrays along the isoelectronic sequence becomes important for 5d-5f beyond Pb 7+ , while the effects of CI on 5p-5d emission only becomes important once these transitions overlap with the 5d-5f array [27]. Overall, they found that CI causes a shift to higher energy and a slight increase in array width.…”

“…Liu et al has identified emission bands in Bi plasmas between 8 nm and 17 nm from 5p-5d, 5d-5f, 5s-5p and 5f-5g transitions in ion stages from Bi 23+ -Bi 35+ [26]. In other related work Liu et al carried out a study to assess the effects of CI on the UTA emission from 5p 6 5d N+1 -5p 5 5d N+2 + 5d N 5f 1 transitions in elements Au to U [27].…”