Relativistic-configuration-interaction calculations ofKα satellite properties for aluminum plasmas created by intense proton beams

Configuration-interaction calculations with Breit-Pauli relativistic corrections have been carried out for aluminum ions for the purpose of studying Kα satellite spectra obtained during intense proton-beam–plasma interaction experiments. We present results for calculated wavelengths, oscillator strengths, and fluorescence yields of Kα satellites for Al i–Al x i . Detailed calculations have been performed both for transitions involving levels of ground-state configurations and for transitions involving levels of low-lying excited configurations with M-shell spectator electrons. Calculated wavelengths for the Kα transitions are compared with a spectrum obtained during a Particle Beam Fusion Accelerator II proton-beam experiment [Lasers Part. Beams 8, 555 (1990)] at Sandia National Laboratories. Our calculations show that the Kα satellite lines of aluminum ions can be classified into two distinct groups: one involving transitions of type 1${\mathit{s}}^1$2${\mathit{s}}^{\mathit{r}}$2${\mathit{p}}^{\mathit{q}}$→1${\mathit{s}}^2$2${\mathit{s}}^{\mathit{r}}$2${\mathit{p}}^{\mathit{q}\mathrm{-}1}$, the other 1${\mathit{s}}^1$2${\mathit{s}}^{\mathit{r}}$2${\mathit{p}}^{\mathit{q}\mathrm{-}1}$3l→1${\mathit{s}}^2$2${\mathit{s}}^{\mathit{r}}$2${\mathit{p}}^{\mathit{q}\mathrm{-}2}$3l. The former consists of the resonance Kα transitions, which gives the characteristic satellite-line position of an ion, while the latter overlaps with the resonance Kα lines of the next-higher ionization stage. We find that both correlation effects and relativistic corrections significantly impact the calculated Kα transition energies.