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Short question: Spontaneous emission from Feynman diagrams?

  1. Sep 21, 2009 #1
    Hey all,
    I am just wondering if one can directly calculate the Einstein coefficient in spontaneous emission of, say, two-level atoms through feynman diagrams? I searched for sources in google but could not find anything.

    Thanks a lot for an answer!

    Wit best regards,
  2. jcsd
  3. Sep 21, 2009 #2
    Maybe I can render the question more precisely: Given a proton in an outer magnetic field I get two energy levels depending on the direction of spin. I can plug the outer field into the Lagrangian. After determing the feynman rules I should be prepared to calculate the decay rate of a proton in the upper energy state.

    Am I right?
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