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Triplet-singlet interaction in the 1s 2s3S1 hyperfine splitting of he-like Li+

  • Atoms
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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The hyperfine structure (hfs) interaction between the metastable 23 S 1 and 21 S 0 states in6, 7Li+ causes very small equal and opposite energy level shifts,δ, in the two levels having the same total angular momentum quantum numberF=I. This amounts to 12ppm with respect to the total hfs splitting of 30 GHz for the7Li+ 23S1 state and has been measured for the first time directly for the case of a core-free electronic system by combined laser-microwave spectroscopy. A new calculation ofδ with accurate integral-transform 21 S 0 and 23S1 wave functions is reported. Configuration interactions and electron exchange and correlation effects, which differ for parallel (3 S 1) and antiparallel (1 S 0) spins, are treated in detail in order to obtain very good agreement between measured and theoretical values for this tiny perturbation. A complete understanding ofδ is indispensable for extracting fundamental constants from two-electron spectroscopic data.

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Authors and Affiliations

  1. Physikalisches Institut der Universität Heidelberg, Federal Republic of Germany

    J. Kowalski, R. Neumann, S. Noehte & H. Suhr

  2. Physikalisches Institut der Universität Heidelberg, Federal Republic of Germany

    G. zu Putlitz

  3. Gesellschaft für Schwerionenforschung, Darmstadt, Federal Republic of Germany

    G. zu Putlitz

  4. Department of Physics, The Pennsylvania State University, University Park, Pennsylvania, USA

    R. Herman

Authors
  1. J. Kowalski
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  2. R. Neumann
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  3. S. Noehte
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  4. H. Suhr
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  5. G. zu Putlitz
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  6. R. Herman
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Additional information

The authors take pleasure in thanking V.H. Smith, Jr., for supplying the Li+ wave functions, and for a helpful conversation. K.S. Meyer is thanked for her help with the numerical computations. The Li+ experiment was sponsored by the Deutsche Forschungs-gemeinschaft. R.H. thanks the Alexander von Humboldt Foundation for an Award in the Special Program for U.S. Senior Scientists, and to the University of Heidelberg for its hospitality.

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Kowalski, J., Neumann, R., Noehte, S. et al. Triplet-singlet interaction in the 1s 2s3S1 hyperfine splitting of he-like Li+ . Z Physik A 313, 147–150 (1983). https://doi.org/10.1007/BF01417220

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  • DOI: https://doi.org/10.1007/BF01417220

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