Magnetic field at nucleus for ionized atoms

The study of the magnetic properties of atoms and nuclei was performed. A linear dependence between the strength of the magnetic field at the nucleus and the effective charge divided by the major quantum number were analyzed and explained. The calculations of the magnetic field at the nucleus were done for a wide set of electron configurations within the framework of relativistic Dirac-Hartree-Fock method. Results are compared to experimental results of $g$-factor measurements.