Physical Review A
Correlation in the2sndRydberg series of F vi
Tomas Brage, L. Engström, Charlotte Froese Fischer
Abstract
The single-configuration, Hartree-Fock-term energy separations of the 2snd ${\mathrm{}}^{1}$D and $^{3}\mathrm{D}$ Rydberg states in berylliumlike fluorine agree remarkably well with the observed separations. It is shown that, in the $^{1}\mathrm{D}$ series, interaction with 2${p}^{2}$ raises the energy of the 2snd levels whereas the remaining interactions lower the levels. The combined effect is such that the $^{1}\mathrm{\ensuremath{-}}^{3}$D separation remains essentially unchanged when correlation effects are added.