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Selection rules for hydrogen

  1. Apr 13, 2013 #1
    Please see attachment. What are the arrow heads supposed to mean? Only emission is allowed and no absorption?
    I mean, selection rules allow Δl=±1. But the figure is saying otherwise.

    I also read in another book, that the only series observed in absorption is that to the ground state, where it is called the p-series.

    Please explain, I am kind of lost in figures and resources.
     

    Attached Files:

  2. jcsd
  3. Apr 13, 2013 #2

    mfb

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    The image is drawn for emission only - absorption is possible, too, if you have some source of light. The combination of excited atoms plus light of the right frequency for a transition can be rare, however.
     
  4. Apr 13, 2013 #3
    But if I reversed the arrows in this figure so that I aim to draw a figure of absorption, all drawn lines will be possible, no?
    (i.e, if I reversed the heads with tails of all arrows presented in the figure).
     
  5. Apr 13, 2013 #4

    mfb

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    They are possible, but you won't see most absorption lines if you shine light on hydrogen in its ground state.
     
  6. Apr 13, 2013 #5
    Ok, thanks, I just wanted to make sure of they were possible! As selection rules explain. Thanks again.
     
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