An atomic Dirac–Fock–Roothaan program Original Research Article

An atomic Dirac–Fock–Roothaan program is described for generalized average energy of configurations using Gaussian-type basis functions. It can treat three kinds of atomic nuclear models of point charge, uniformly charged sphere, and Gaussian proton-charge distribution. It runs within first memories or uses disk file for intermediate storage of two-electron integrals so that any calculations using basis sets of very large sizes can be performed.