Two-photon exchange corrections to the $g$ factor of Li-like ions

  title={Two-photon exchange corrections to the \$g\$ factor of Li-like ions},
  author={V. Yerokhin and C. Keitel and Z. Harman},
We report calculations of QED corrections to the g factor of Li-like ions induced by the exchange of two virtual photons between the electrons. The calculations are performed within QED theory to all orders in the nuclear binding strength parameter Zα, where Z is the nuclear charge number and α is the fine-structure constant. In the region of low nuclear charges we compare results from three different methods: QED, relativistic many-body perturbation theory, and nonrelativistic QED. All three… Expand

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