Orville W. Day

Extension of Koopmans’ theorem. I. Derivation

Darwin W. Smith, Orville W. Day · The Journal of Chemical Physics · 1975 · 216 citations

Quantum Science, Reference States, Spin Orbitals +9

Extension of Koopmans’ theorem. II. Accurate ionization energies from correlated wavefunctions for closed-shell atoms

Orville W. Day, Darwin W. Smith, Robert C. Morrison · The Journal of Chemical Physics · 1975 · 99 citations

Engineering, Nuclear Physics, Computational Chemistry +20

A generalization of the hartree-fock one-particle potential

Orville W. Day, Darwin W. Smith, Claude Garrod · International Journal of Quantum Chemistry · 2009 · 99 citations

Extension of Koopmans’ theorem. IV. Ionization potentials from correlated wavefunctions for molecular fluorine

James C. Ellenbogen, Orville W. Day, Darwin W. Smith et al. · The Journal of Chemical Physics · 1977 · 32 citations

Engineering, Molecular Fluorine, Computational Chemistry +17

An extension of koopmans' theorem III. ionization energies of the open-shell atoms Li and B

Robert C. Morrison, Orville W. Day, Darwin W. Smith · International Journal of Quantum Chemistry · 2009 · 14 citations

Theorem Iii, Engineering, Nuclear Physics +16