Energy Levels Of Hydrogen-Like Atomsand Fundamental Constants

Details Energy Levels Of Hydrogen-Like Atomsand Fundamental Constants Energy Levels Of Hydrogen-Like Atomsand Fundamental Constants

1993-09-27

arxiv.org/abs/hep-ph/9309327v2

Phys.Part.Nucl.25:58-91,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX file, 68 pp. (figures are available on request)

Scientific paper

The present review includes the description of theoretical methods for the investigations of the spectra of hydrogen-like systems. Various versions of the quasipotential approach and the method of the effective Dirac equation are considered. The new methods, which have been developed in the eighties, are described. These are the method for the investigation of the spectra by means of the quasipotential equation with the relativistic reduced mass and the method for a selection of the logarithmic corrections by means of the renormalization group equation. The special attention is given to the construction of a perturbation theory and the selection of graphs, whereof the contributions of different orders of $\alpha$, the fine structure constant, to the energy of the fine and hyperfine splitting in a positronium, a muonium and a hydrogen atom could be calculated. In the second part of this article the comparison of the experimental results and the theoretical results concerning the wide range of topics is produced. They are the fine and hyperfine splitting in the hydrogenic systems, the Lamb shift and the anomalous magnetic moments of an electron and a muon. Also, the problem of the precision determination of a numerical value of the fine structure constant, connected with the above topics, is discussed.

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