Relativistic spin-density-functional theory: Robust solution of single-particle equations for open-subshell atoms

We present an approach to the solution of the collinear form of the single-particle equations of relativistic spin-density-functional theory. It is based on the use of appropriate boundary conditions for r-0,infinity and the identification of spin-up and spin-down solutions by a node quantum number. A comparison with previous results and a complete set of reference data for atomic ground states is provided.