SEARCH Articles Figures Tables Electron Hamiltonians Electron operators Electronic Hamiltonian Electronic Hamiltonian symmetry operators with Electronic Hamiltonians Electronic configuration Hamiltonian operator Hamiltonian operator Hamiltonian operator electronic structure calculations Hamiltonian operator electrons Hamiltonian operator many-electron atoms Hamiltonian operator purely electronic Hamiltonian operators electron correlation methods Hamiltonian operators electronic structure methods Hamiltonians electronic Hamiltonian Many-electron Hamiltonian operator Operators electronic