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Spectroscopy - Forbidden transitions appearing in spectrum

  1. May 10, 2015 #1
    1. The problem statement, all variables and given/known data

    Why do supposedly forbidden transitions appear in experimental spectrums?

    2. Relevant equations

    3. The attempt at a solution

    I'm really puzzled as to why they appear. Can it be due to transitions on higher energy levels that happen to be equal to the forbidden ones?
  2. jcsd
  3. May 10, 2015 #2


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    2017 Award

    Staff: Mentor

    "Forbidden" rarely means completely impossible in spectroscopy. It is just highly suppressed.
    What does "suddenly" mean here?

    Random coincidences with unrelated transitions are possible, but unlikely if the resolution is good enough.
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