Experiments at HITRAP

The precise measurement of the g-factor of the electron bound in a hydrogen-like ion is a sensitive test of bound-state Quantum Electrodynamics (QED) at high fields. Highly charged ions are ideal for such studies, because the electromagnetic 

FIGURE 7.6 Contributions to the g-factor versus nuclear charge Z. For heavy ions, the situation is more difficult, but also more interesting, since the QED and nuclear size contributions become comparable. 

In relativistic Dirac theory, the g-factor of an electron bound to a H-like ion is given by [6,7] 

HGURE 7.7 Schematic of the double Penning trap setup used for g-factor measurements of the bound electron. 

FIGURE 7.8 Larmor resonance of the g-factor measurement of the bound electron in C + pO]. 

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