Abstract
XUV photoabsorption spectra of caesium, in ion stages up to Cs4+, have been obtained experimentally with the dual laser-produced plasma technique. From the results it can be inferredthat the 4d photoabsorption cross-section changes dramaticallyin appearance along the isonuclear sequence Cs throughCs4+. While the spectra of Cs, Cs+ and Cs2+ aredominated by a giant dipole 4d →εfresonance, discrete structure, which essentially increases inintensity with increasing ion stage, is also present below threshold. Between Cs2+ and Cs3+ much of the oscillator strength is abruptly transferred from the continuumto the discrete spectrum so that a few intense broad featuresdominate the spectra of Cs3+ and Cs4+. Multiconfiguration Hartree-Fock calculations successfullyaccount for this behaviour and permit identification of thediscrete features.
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