Approximate electron removal energies in density-functional theory from post-hoc correction of local-spin-density eigenvalues

One-electron energies which approximate proper atomic electron-removal energies are constructed by post-hoc correction of bare local-spin-density–approximation eigenvalues (which are poor approximations to ionization potentials). The corrections give the proper atomic H limit, come decently close to the self-interaction–corrected eigenvalues, and only require quantities generated in routine self-consistent-field local-spin-density calculations.