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Phys. Rev. A 74, 022512 (2006) [17 pages]

⁴ corrections to singlet states of helium

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Krzysztof Pachucki
Institute of Theoretical Physics, Warsaw University, Hoa 69, 00-681 Warsaw, Poland

Received 7 July 2006; published 31 August 2006

Correctionsof order alpha ⁴ [script R] are calculated for the singlet states 1 ¹S₀and 2 ¹S₀ of the helium atom. The result for the1 ¹S₀ state is in slight disagreement with that of Korobovand Yelkhovsky [Phys. Rev. Lett. 87, 193003 (2001)]. The resultsobtained lead to a significant improvement of the transition frequenciesbetween low-lying levels of the helium atom. In particular theoreticalpredictions for the 2 ¹S₀-1 ¹S₀ transition are found to be indisagreement with experimental values.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.022512
DOI:	10.1103/PhysRevA.74.022512
PACS:	31.30.Jv; 12.20.Ds; 31.15.Md; 32.10.Fn 31.30.Jv Relativistic and quantum electrodynamic effects in atoms and molecules 12.20.Ds Specific calculations in quantum electrodynamics 31.15.Md Perturbation theory (atoms and molecules) 32.10.Fn Atomic fine and hyperfine structure YEAR: 2006
KEYWORDS:	helium neutral atoms, relativistic corrections, excited states, quantum electrodynamics, perturbation theory, fine structure

REFERENCES (29)

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