Comparison of the effective potentials for the ground , singly excited , and doubly excited states of He.
Calculated singly ES energies (hartree) of atomic systems with the different X-only methods.
Total energies (hartree) for doubly ESs of He at different levels of approximation.
Double excitations of He (in hartree). Numbers in parentheses denote the absolute percentage of error with respect to the best theoretical data (exact).
Convergence of the energy (hartree) for doubly ESs at X-only level of approximation.
Comparison of calculated at the XC level doubly excited potential energy curves (hartree) of .
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