Magnetic shielding 6 Relativistic effects 6 Spin-rotations Tensors 6 Born-Oppenheimer 4 Linear response 4 Molecular Hamiltonian 4 Molecular dynamics 4 Molecular rotations 4 Nuclear magnetic shieldings 4 Perturbative expansion 4 Relativistic electron 4 Small components 4 Spectral parameters 4 Stereochemistry 4 Theoretical expression 4 Theoretical study 4 Accurate calculations 2 Atoms 2 Computational chemistry 2 G tensors 2 Molecules 2 NMR 2 Nuclear magnetic resonance 2 Quantum chemistry 2 Relativity 2 Response properties 2 Shielding 2 Spectroscopic parameters 2 Spin dynamics 2