Many-Body Effects in Atomic Hyperfine Interaction
Our understanding of the atomic hyperfine interaction has improved considerably during the last ten years, due to important progress experimentally as well as theoretically. The advent of optical resonance and laser methods has made it possible to study a large number of shortlived excited states, and the further development of the atomic-beam method has made many metastable states accessible for experimental study. These experiments have clearly demonstrated that the simple single-particle model is unsufficient to explain the atomic hyperfine interaction, which means that many-body effects have to be taken into account. Our methods of handling many-body problems theoretically have also improved drastically lately. Techniques such as the linked-diagram expansion and the effective-operator formalism have here been found to be extremely useful. The rapid development of electronic computers have furthermore made it possible to apply these fairly complicated methods not only to the lightest atoms. The two previous talks have been mainly concerned with the experimental development in this field, and, therefore, I shall in my talk concentrate on the theoretical side of the problem and try to explain how the experimental results can be interpreted in the light of recent many-body calculations.
KeywordsHyperfine Interaction Quadrupole Interaction Effective Operator Alkali Atom Open Shell
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