4s-1s two-photon decay in hydrogen atom with allowance for cascades

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The 4s-1s two-quantum decay in the hydrogen atom is calculated in the framework of quantum electrodynamics with allowance for cascades. It is shown that the pure two-photon contribution cannot be separated from the contribution of cascade processes. Interference between the transitions of these two types is comparable in magnitude with the oure two-photon contribution. The separation of pure two-photon contributions is discussed recently in connection with the role of two-photon decays in the separation of radiation from amtter in the early Universe.
Original languageEnglish
Pages (from-to)328-334
JournalOptics and Spectroscopy (English translation of Optika i Spektroskopiya)
Issue number3
StatePublished - 2011


  • hydrogen atom
  • two-photon decay
  • cascades
  • separation of radiation from matter


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