15,583 research outputs found
Electronic charge density in helium in the first order shielding approximation
Electronic charge density for ground state of helium as function of nuclear charg
Some Remarks on the Use of the Variational Principle for the Second Order Energy
Approximate ground state wave function used in variational principle for second order energ
Variational method 3 - Steady state time dependent perturbation theory
Steady state time dependent perturbation theory and variational principle
The variational method 2 - Perturbation theory
Variational method to approximate solutions of perturbation equations, perturbation analyses, and use of perturbation theory to infer variational principl
Variational methods and degenerate perturbation theory
Variational methods and degenerate perturbation theor
Theorems satisfied by variational wave functions in scattering theory
Various theorems in the theory of spinless particle scattering by a real central potential are derived directly from the Kohn variational principle
Two notes on perturbation theory. 1 - Interchange theorems and the variation principle. 2 - PV in a different notation
Interchange theorems and variational principle in perturbation theor
Gauge invariance, current conservation, and GIAO's
The well known relationship between gauge invariance and current conservation is exhibited within the usual quantum mechanical formalism. It is then shown that the use of gauge-invariant atomic orbitals (GIAO) does not necessarily lead to the expected current conservation. The reason is found to lie in the constrained nature of the gauge invariance which is provided by the use of GIAO's. It is concluded that this invariance is, of itself, no argument in favor of their use
Improvement of uncoupled Hartree-Fock expectation values for physical properties, II
Improvement of uncoupled Hartree-Fock expectation values for physical propertie
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