SEARCH Articles Figures Tables Effective Hamiltonian Effective Hamiltonian valence-only Effective Hamiltonians Effective valence Hamiltonian method Effective valence-shell Hamiltonian Hamiltonian valence Molecular method: valence effective hamiltonian Poly valence effective hamiltonian calculation Polymers treated with the valence effective Hamiltonian Quantum chemistry Valence effective Hamiltonian Valence Bond Formalism Using an Effective Hamiltonian Valence effective Hamiltonian technique Valence-only effective Hamiltonians