EntityQ631614· pop 26· linked from 108 articlesLamb shiftSign in to savedifference in energy of hydrogenic atom electron states not predicted by the Dirac equationConnectionselectric potentialEntitytauEntityup quarkEntitycharm quarkEntitydown quarkEntitytop quarkEntitystrange quarkEntitybottom quarkEntityfine structureEntitypath integralEntityphysicsEntityatomEntityBlack holeConceptQ7085EntitymoleculeEntityquantum mechanicsEntityelectronEntityInternational Standard Book NumberEntityprotonEntityRichard FeynmanEntityCategoriesPhysical quantitiesQuantum electrodynamics