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Rotational spectrum assignment

  1. Apr 16, 2015 #1
    If I have the energy value (in cm-1) of a specific line in the rotational spectrum, how do I find out/assign the correct J''-J' values?

    I know the selection rules for J to be +/- 1 for each rotational transition but I'm not sure how you can correctly identify which J value it is if your only given the energy.. The rotational parameter B isn't specified either so I'm puzzled.

    Any help?
  2. jcsd
  3. Apr 16, 2015 #2


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    Staff: Mentor

    I don't think it is possible to assign anything to just a single line.
  4. Apr 16, 2015 #3

    Quantum Defect

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    Homework Helper
    Gold Member

    Do you know what the molecule is?
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