Higher Rydberg states of He using the polarized-orbital method

Rydberg states of He of the configuration $(1snl{)}^{1,3}D$, ¹,³F for n=3-7 have been calculated using polarized-orbital and related approximations, notably the extended-polarization approximation. The singlet states are superior in the full polarized-orbital approximation whereas the triplet cases are better in the extended-polarization approximation. Reasons for this behavior are given. Comparison is also made with recent diagrammatic calculations of Chang and Poe. A comment on some recent polarized-orbital calculations of photoionization is included.