Articles you may be interested inMaking four-and two-component relativistic density functional methods fully equivalent based on the idea of "from atoms to molecule" A two-component variant of the Douglas-Kroll relativistic linear combination of Gaussian-type orbitals densityfunctional method: Spin-orbit effects in atoms and diatomics Comment on "Four-component relativistic density functional calculations of heavy diatomic molecules" [J. Chem.A new four-component Dirac-Kohn-Sham ͑DKS͒ method is presented. The method provides a computationally efficient way to perform fully relativistic and correlated ground state calculations on heavy-atom molecular systems with reliable accuracy. The DKS routine has been implemented in the four-component Dirac-Hartree-Fock program system REL4D. Two-component generally contracted, kinetically balanced Gaussian-type spinors ͑GTSs͒ are used as basis spinors. The one-electron and Coulomb integrals are computed analytically, and exchange-correlation potentials are calculated with a numerical grid-quadrature routine. An approximation scheme is presented to reduce the evaluation time of the two-electron repulsion integrals over full sets of small-component GTSs, (SS͉SS). Benchmark calculations for the ground states of the group IB hydrides, MH, and dimers, M 2 ͑MϭCu, Ag, and Au͒, by the DKS method are presented.