Resonance lines of nickel-like highly-charged ions are identified in the spectra of seven elements (Ta, W, Re, Pt, Au, Hg and Pb) excited by laser irradiation.They pertain mainly to transitions 3d-nf (n = 5 through 9), 3 p n d (n = 4 through o) and 3s-np (n = 4, 5). Unresolved transition arrays of lower charge ions isoelectronic with copper, zinc, gallium and germanium, are also interpreted, as well as a few cobalt-like transitions. The relativistic parametric potential method and the unresolved transition array formalism support this analysis.
The 3d-4f and 3d-5f emission patterns occurring between 4.5 and 6.5 A in the spectra of laserproduced plasmas of highly ionized tantalum are studied, and the pseudocontinuum which underlies the former is interpreted. For the transition subarrays suspected to be responsible for the pseudocontinuum, the average wavelengths and widths are computed ab initio in the formalism of spinorbit-split arrays; these subarrays are proven to cover a continuous band of wavelengths. For their intensities, the dielectronic recombination (DR) process populates efficiently the upper configurations, which, in most cases, lie above the ionization levels. The autoionization and radiative-transition probabilities, and the DR coefficients, are computed ab initio, in the form of averages for whole configurations or subconfigurations of Cu-like tantalum. The compact formulas for these averages are valid in intermediate coupling, avoiding any diagonalization. All the needed radial integrals are computed by means of a relativistic parametric potential central-field code.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.