One-electron spectrum of Yb +: Relativistic energies, transition probabilities and dipole polarizability

Abstract

Calculations are reported of relativistic ionization energies and transition probabilities in the one-electron spectrum of singly-ionized ytterbium. The relativistic model potential approach used takes into account both valence-core electron exchange and correlation. The influence of polarization of the core by valence electrons on ionization energies and transition probabilities has been studied. Strong cancellation effects have been found for higher transitions of the principal series; these affect both transition probabilities and relative line strengths. The energies are predicted for some states which have not yet been experimentally localized. The static dipole polarizability for Yb + is estimated to be 48.18 g 0 3 from computed oscillator strengths; this estimate is compared with lower bounds determined from experimental data.