Nonlocal potentials based on angular-momentum projection operators can be transformed into local, yet angular-momentum dependent, pseudo-Hamiltonians by modifying the kinetic energy operator. Ionic pseudo-Hamiltonians of this type can replace core electrons in atomic calculations. Their use in Green’s-Function Monte Carlo simulations gives accurate electron affinities, ionization, and binding energies for second-row atoms and diatomics. This opens the way to quantum simulations of many condensed-matter systems.

• Received 28 April 1988

DOI:https://doi.org/10.1103/PhysRevLett.62.2088