Comment on the magnetic dipole hyperfine interaction in the gold atom ground state

The multiconfiguration Dirac - Hartree - Fock (MCDHF) model has been employed to calculate the magnetic dipole hyperfine constant A of the 5d(10)6s S-2(1/2) ground state of atomic gold. Electron correlation effects contribute more than 20% to the total value of A. We investigated the effects of single, double, and a subset of triple substitutions. The calculations reveal strong cancellations between one-, two- and three-particle correlation effects. It is demonstrated that in the case of the ground state of atomic gold the three-particle effects are comparable in size to the one- and two-particle ones.