Fine structure of helium-like ions and determination of the fine structure constant

Details Fine structure of helium-like ions and determination of the fine structure constant Fine structure of helium-like ions and determination of the fine structure constant

2010-01-28

arxiv.org/abs/1001.5116v2

Phys. Rev. Lett. 104, 070403 (2010)

Physics

Atomic Physics

4 pages, 3 tables, with a typo in Eq. (9) corrected

Scientific paper

We report a calculation of the fine structure splitting in light helium-like atoms, which accounts for all quantum electrodynamical effects up to order \alpha^5 Ry. For the helium atom, we resolve the previously reported disagreement between theory and experiment and determine the fine structure constant with an accuracy of 31 ppb. The calculational results are extensively checked by comparison with the experimental data for different nuclear charges and by evaluation of the hydrogenic limit of individual corrections.

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