Variational Wavefunctions and Energies for L = 2 and L = 3 States of Two‐Electron Atoms

Variational wavefunctions and energies have been obtained for the $n^1{\mathrm{D,\; n}}^3{\mathrm{D,\; n}}^{1}F$ , and $n^{3}F$ (through $\text{n\hspace{0.17em}=\hspace{0.17em}8}$ ) levels of the helium isoelectronic sequence through $\text{Z\hspace{0.17em}=\hspace{0.17em}16}$ . The trial functions are configuration–interaction expansions in members of a denumerably complete basis set (Sturmian functions), with 39 terms used for the $D$ states and 18 terms used for the $F$ states. Differences between calculated and observed $D$ state energies of He and Li⁺ range from 0.000001 to 0.00005 a.u.