Approximation theory 8 Magnetic molecular properties 8 Magnetic shielding 8 Bromine compounds 4 Coulomb and Breit two-body interaction operators 4 Differential equations 4 Eigenvalues and eigenfunctions 4 Elimination of small component approach (ESC) 4 Error correction 4 Fermi contact 4 Fermi level 4 Ground state 4 Hamiltonians 4 Iodine compounds 4 Kinetic energy 4 Magnetic fields 4 Magnetic moments 4 Magnetic potential 4 Mathematical operators 4 Matrix algebra 4 No-pair approximation 4 Nuclear magnetic shielding 4 Nuclear magnetic shielding tensor 4 Paramagnetism 4 Perturbation techniques 4 Random-phase approximation (RPA) 4 Schrodinger molecular energy 4 Spin-other orbit interactions 4 State space methods 4 Technetium 4