Physics – Atomic Physics
Scientific paper
2009-04-15
Phys. Rev. A 80, 062514 (2009)
Physics
Atomic Physics
17 pages, 4 figures, 1 table
Scientific paper
10.1103/PhysRevA.80.062514
The problem of the evaluation of the two-photon decay width of excited states in hydrogen is considered. Two different approaches to the evaluation of the width including cascades channels are employed: the summation of the transition probabilities for various decay channels and the evaluation of the imaginary part of the Lamb shift. As application the decay channels for the 3s level of the hydrogen atom are evaluated, including the cascade transition probability 3s-2p-1s as well as "pure" two-photon decay probability and the interference between both channels. An important role should be assigned to the "pure" two-photon probability in astrophysics context, since processes of this kind provide a possibility for the decoupling of radiation and matter in the early Universe. We demonstrate the ambiguity of separation of the "pure" two-photon contribution and criticize the existing attempts for such a separation.
Labzowsky Leonti
Plunien Guenter
Solovyev D.
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