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agree with experiment agreement angular integrations appear application approximate arbitrary factor assumed atom becomes Breit calc calculating center of gravity change charged classical comparison considering consists contains contradict contribution coordinates correspondence Coulomb data derived determined different DIRAC doublet separation doubtful terms easy electron energy expression extend field following function is separable give given helium helpful hydrogen wave hyperfine structure interest introduced involved known Lande last leads levels LINEAR magnetic manner meaning measurements member naturally nuclear spin nucleus numeral obtaining operate orbital order orientation particle perturbation Phys physical possible present treatment print Proc Professor Goudsmit proper quantum radial ratio reality reduction refers relative relativistic represent results second similar spin-orbit interaction spin-spin splitting sum rules terms would effect test theory triplet TWO-BODY PROBLEM unperturbed equation usual value vector model wave equation wave function Zeits