Holomorphic Hartree-Fock Theory and Configuration Interaction
  We investigate the Hartree-Fock solutions to H2 in a minimal basis. We note the properties of the solutions and their disappearance with geometry and propose a new method, Holomorphic Hartree-Fock theory, where we modify the SCF equations to avoid disappearance of the solutions. We use these solutions as a basis for a non-orthogonal Configuration Interaction to produce a smooth binding curve over a complete range of geometries. 
Hamish G. Hiscock and Alex J. W. Thom
physics.chem-ph