SEARCH Articles Figures Tables Breit interaction / operator Breit interaction / operator Li-like ions Breit interaction / operator frequency-independent Breit interaction / operator importance Breit interaction / operator negative-energy Breit interaction / operator normal order Breit interaction / operator retarded Coulomb interaction operator Crystal-field interaction equivalent operators Dipole operator interaction with radiation field Electromagnetic Interaction Energy Operator Electrostatic interaction operator Exchange interaction operators Hamiltonian operator for non-interacting particles Hydrophobic interaction chromatography operation Interaction Using Kramers Pair Creation Operators Interactions between symmetry operations Interactions spin Hamiltonian operator Intermolecular interaction operator Operator of averaged electrostatic interaction Sequence-specific interactions, operator The Breit Operator for Retarded Interactions The Gaunt Operator for Unretarded Interactions