The g Factor of Hydrogenic Ions: A Test of Bound State QED

  • G. Werth
  • H. Häffner
  • N. Hermanspahn
  • H.-J. Kluge
  • W. Quint
  • J. Verdú
Part of the Lecture Notes in Physics book series (LNP, volume 570)


We present a new experimental value for the magnetic moment of the electron bound in hydrogenlike carbon (12C5+): g exp = 2.001 041 596 (5). The experiment was carried out on a single 12C5+ ion stored in a Penning trap. The high accuracy was made possible by spatially separating the induction of spin flips and the analysis of the spin direction. Experiment and theory test the bound-state QED contributions to the gJ factor of a bound electron to a precision of 1%. We discuss also implications of the experiment on the knowledge of the electron mass.


Cyclotron Frequency Spin Direction Cyclotron Motion Tank Circuit Analysis Trap 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • G. Werth
    • 1
  • H. Häffner
    • 1
    • 2
  • N. Hermanspahn
    • 1
  • H.-J. Kluge
    • 2
  • W. Quint
    • 2
  • J. Verdú
    • 2
  1. 1.Johannes Gutenberg UniversitätMainzGermany
  2. 2.Gesellschaft für SchwerionenforschungDarmstadtGermany

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