Extreme ultraviolet photoabsorption spectra of the Ce VI–Ce X isonuclear sequence

Abstract

The extreme ultraviolet photoabsorption spectra of cerium from five to nine times ionized have been recorded in the 70–120 eV region using the dual laser plasma technique. These represent the highest ion stages observed to date using this method. The spectra below 115 eV were found to be dominated by 4d → 5p transitions from the ground configurations of these ions and the resulting lines were identified with the aid of Hartree–Fock with configuration interaction calculations. Some features due to 4d → 5p transitions from the metastable configurations of ions Ce VI–Ce X were also observed.

Soft x-ray spectra of cerium laser-produced plasmas

“…Calculations with configuration interaction show that the configuration average energies of all but two configurations of the type (5s5p4f ) q , where q ranges from 8 in Ce 4+ down to 1 in Ce 11+ , are within 100 eV of the ground state of the ions Ce 4+ to Ce 10+ , as shown in table 1. In a photoabsorption experiment on Ce 4+ ions [35] strong absorption due to the 4d 10 -4d 9 4f 1 S-1 P transition was not observed. In its place structure due to overlapping 4d-4f transitions from a large number of 5p n 4f m states was seen, which varied with pulse energy due to the differences in excited state populations produced at different electron temperatures.…”

Experimental and Theoretical Study of the 5s\(^2\)5p\(^3\) and 5s\(^5\)p\(^4\) Configurations in Sb-like Cerium

“…(b) Figure 1. (a) Isoelectronic plot of the energy levels of ground configuration and (b) Isoelectronic plot of 5s5p 4 configuration. E is the energy of the level in cm −1 and ξ is the charge number of the ion (ξ = 8 for Ce VIII) Except 4 S 3/2 , all the other four levels of ground configuration were still unknown.…”

“…configurations. An analysis of this spectrum along with Ce VII was done by Tauheed et al [3], where only three excited levels, namely, 4 P 5/2 , 4 P 3/2 and 4 P 1/2 of the 5s5p 4 configuration have been reported. Recently, Gaynor et al [4] employed the dual laser-produced plasma technique to study the 4d 9 5s 2 5p 4 core-excited configuration of Ce VIII.…”

4f photoabsorption in Pt+ to Pt4+

“…Absorption spectra of platinum ions were obtained, in two separate experimental setups, using the DLP technique which is outlined in [19]. For the majority of the spectra, the output of a Q-switched neodymium yttrium aluminium garnet (Nd:YAG) laser (1064 nm, 10 Hz, 0.8 J in 6 ns) was focused through a plano-convex cylindrical lens to a 0.5 mm × 8 mm spot on a platinum target to generate a plasma containing the ions of interest.…”