Abstract
The photoabsorption spectra of Sb+, Sb2+, Sb3+ and Sb4+ have been obtained in the XUV spectral region with the dual laser-produced plasma (DLP) technique. Photoexcitation from the 4d subshell is the dominant process in the 30-100 eV energy region. In Sb+, for photon energies between 30 and 50 eV, discrete structure corresponding to 4d np, n1f (n5,n14) transitions is obtained, while above 50 eV the spectrum is dominated by an intense 4df resonance. Apart from the 4d5p transitions the features are very weak. The 4df resonance is still observed in Sb2+ as the dominant feature in the spectrum, but in Sb3+ and Sb4+ there is significant transfer of oscillator strength from the continuum to the discrete spectra, in particular to the 4d nf transitions. This behaviour mirrors the effects of contraction of the 4f wavefunction, which is seen to be more gradual here than in elements with Z>54. Multiconfiguration Hartree-Fock and time-dependent local density approximation calculations successfully reproduce this behaviour.
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