Improved theory of helium fine structure
Krzysztof Pachucki
Abstract
Improved theoretical predictions for the fine-structure splitting of 23PJ levels in helium are obtained by the calculation of contributions of order α5 Ry. New results for transition frequencies, ν01 = 29 616 943.01(17) kHz and ν12 = 2 291 161.13(30) kHz disagree significantly with the experimental values, indicating an outstanding problem in bound state QED.
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