QED calculation of the n=1 and n=2 energy levels in He-like ions

Details QED calculation of the n=1 and n=2 energy levels in He-like ions QED calculation of the n=1 and n=2 energy levels in He-like ions

2005-01-15

arxiv.org/abs/physics/0501079v1

Phys. Rev. A v.71, 062104 (2005)

Physics

Atomic Physics

23 pages, 5 figures

Scientific paper

10.1103/PhysRevA.71.062104

We perform ab initio QED calculations of energy levels for the $n=1$ and $n=2$ states of He-like ions with the nuclear charge in the range $Z = 12$-100. The complete set of two-electron QED corrections is evaluated to all orders in the parameter $\aZ$. Uncalculated contributions to energy levels come through orders $\alpha^3 (\aZ)^2$, $\alpha^2 (\aZ)^7$, and higher. The calculation presented is the first treatment for excited states of He-like ions complete through order $\alpha^2 (\aZ)^4$. A significant improvement in accuracy of theoretical predictions is achieved, especially in the high-$Z$ region.

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