Phys. Rev. A 71, 062104 (2005) [26 pages]QED calculation of the n=1 and n=2 energy levels in He-like ionsReceived 14 January 2005; published 21 June 2005 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 αZ. Uncalculated contributions to energy levels come through orders α3(αZ)2, α2(αZ)7, and higher. A significant improvement in accuracy of theoretical predictions is achieved, especially in the high-Z region. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.062104
DOI:
10.1103/PhysRevA.71.062104
PACS:
12.20.Ds, 31.30.Jv, 31.10.+z
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