Improved theory of helium fine structure

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  • 6 April 2006
Abstract
Improved theoretical predictions for the helium fine-structure splitting of $2^3P_J$ levels are obtained by the calculation of the higher order $\alpha^5 $Ry contribution. New results for transition frequencies: $\nu_{01} = 29 616 943.01(17)$ kHz and $\nu_{12} = 2 291 161.13(30)$ kHz significantly disagree with experimental values, what rises an outstanding problem in bound state QED.