Perturbation calculations on the split-shell wavefunctions of two-electron atoms

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mi /><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi /><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mprescripts /><…

1959 • 744 citations

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1962 • 691 citations

Logarithmic Terms in the Wave Functions of the Ground State of Two-Electron Atoms

1966 • 407 citations

Two-Electron Atoms III. A Sixth-Order Perturbation Study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>Ground State

1963 • 195 citations

Simple Configuration-Interaction Wave Functions. I. Two-Electron Ions: A Numerical Study

1960 • 180 citations

The Use of Perturbation Methods for the Study of the Effects of Configuration Interaction

1967 • 164 citations

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1962 • 159 citations

Hydrogen-Atom Polarizability as a Hartree–Fock Perturbation Expansion: A Geometric Approximation to Atomic Polarizabilities

1968 • 115 citations

Feenberg–Goldhammer Procedure and Geometric Approximation in Hartree–Fock Perturbation Theory

1970 • 93 citations

Advances in Quantum Chemistry, Vol. 17

1986 • 63 citations

Dispersion forces, second- and third-order energies

1968 • 57 citations

The geometric approximation of physical properties

1970 • 47 citations

Different Perturbed Uncoupled Hartree–Fock (PUCHF) Methods for Physical Properties. I. Theory and Dipole Polarizabilities

1971 • 32 citations

Correction of Configuration-Interaction Wavefunctions by Perturbation Theory

1966 • 26 citations

Modified Hamiltonians for Localized Orbitals and for the Removal of Degeneracies

1971 • 25 citations

Different Screening Constants for Different Physical Properties. I

1965 • 24 citations

Diagrammatical Derivation and Representation of Rayleigh–Schrödinger Perturbation Theory

1968 • 17 citations

A perturbation calculation on helium

1972 • 17 citations

Lower Bounds to Expectation Values: Two-Electron Atoms

1973 • 14 citations

On a Modified Rayleigh—Schrödinger Perturbation Expansion

1971 • 13 citations

Perturbation Calculation of Atomic Polarizabilities

1971 • 9 citations

Perturbation calculations without H° or H1

1968 • 9 citations

Note on the Hylleraas-Eckart split-shell description of the groundstate of atomic two-electron systems

1968 • 4 citations

On the choice of the zero-order operator in perturbation theory

1972 • 4 citations

Expressions for multiple perturbation energies

1971 • 2 citations