EntityQ1413102· pop 30· linked from 174 articleshyperfine structureSign in to savesmall shifts and splittings in the energy levels of atoms, molecules and ionsConnectionstensorEntityatomEntitylightEntitymercuryEntitymoleculeEntitysecondEntityEnrico FermiEntityInternational Standard Book NumberEntitycaesiumEntityantimonyEntityrubidiumEntityindiumEntityelectric currentEntityCarl SaganEntityeuropiumEntitylutetiumEntityvacuumEntitymagnetic fieldEntityatomic nucleusEntityionEntityCategoriesAtomic physicsFoundational quantum physics