W. C. Nieuwpoort

Approximate Radial Functions for First-Row Transition-Metal Atoms and Ions. I. Inner-Shell, 3<i>d</i> and 4<i>s</i> Atomic Orbitals

James W. Richardson, W. C. Nieuwpoort, R. R. Powell et al. · The Journal of Chemical Physics · 1962 · 494 citations

Natural Sciences, Chemistry, Physics +13

Relativistic quantum chemistry: the MOLFDIR program package

Lucas Visscher, O. Visser, P. J. C. Aerts et al. · Computer Physics Communications · 1994 · 331 citations

Natural Sciences, Chemistry, Physics +14

Approximate Radial Functions for First-Row Transition-Metal Atoms and Ions. II. 4<i>p</i> and 4<i>d</i> Atomic Orbitals

James W. Richardson, R. R. Powell, W. C. Nieuwpoort · The Journal of Chemical Physics · 1963 · 218 citations

Natural Sciences, Chemistry, Physics +14

Relativistic and correlation effects on molecular properties. II. The hydrogen halides HF, HCl, HBr, HI, and HAt

Lucas Visscher, Jacek Styszyński, W. C. Nieuwpoort · The Journal of Chemical Physics · 1996 · 137 citations · Full text

Natural Sciences, Chemistry, Physics +17

Molecular open shell configuration interaction calculations using the Dirac–Coulomb Hamiltonian: The <i>f</i> 6-manifold of an embedded EuO9−6 cluster

O. Visser, Lucas Visscher, P. J. C. Aerts et al. · The Journal of Chemical Physics · 1992 · 132 citations · Full text

Natural Sciences, Chemistry, Physics +17