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The 4s-4p, 4p-4d, and 4d-4f transitions of ten copperlike and zinclike ions from Ba²⁶⁺ to W⁴⁵⁺ have been observed by means of a laser-produced plasma and a 2.2-m grazing-incidence spectrograph. The spectra are accompanied by a prominent continuum lying just below the 4p²P1/2-4d²D3/2 transitions in the copperlike ions. The results support the identification of the resonance lines of Xe²⁴⁺ and Xe²⁵⁺ in the Princeton University ST tokamak by Hinnov.
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Reader et al. (1980) studied this question.
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