Physics – Atomic Physics
Scientific paper
2006-03-11
Phys. Rev. Lett. 97, 13002 (2006)
Physics
Atomic Physics
4 pages
Scientific paper
10.1103/PhysRevLett.97.013002
Improved theoretical predictions for the fine-structure splitting of $2^3P_J$ levels in helium are obtained by the calculation of contributions of order $\alpha^5 Ry$. New results for transition frequencies, $\nu_{01} = 29 616 943.01(17)$ kHz and $\nu_{12} = 2 291 161.13(30)$ kHz disagree significantly with the experimental values, indicating an outstanding problem in bound state QED.
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