title: On the nodal structure of single-particle approximation based atomic wave functions.
abstract: The nodal structures of atomic wave functions based on a product of spatial orbitals, namely, restricted, unrestricted, and generalized valence bond wave functions, are shown to be equivalent. This result is verified by fixed node-diffusion Monte Carlo simulations for atoms up to Ne. Also for a molecular system, Li(2) at the equilibrium geometry, a multideterminantal generalized valence bond wave function does not improve the nodal surfaces of a restricted Hartree-Fock wave function.
authors.affiliation: Dipartimento di Scienze Chimiche ed Ambientali, Universita dell'Insubria, via Lucini 3, 22100 Como, Italy. dario.bressanini@uninsubria.it
authors.forename: Dario
authors.initials: D
authors.lastname: Bressanini
authors.forename: Gabriele
authors.initials: G
authors.lastname: Morosi