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Homework Help: Rotational spectroscopy

  1. Nov 20, 2008 #1
    1. The problem statement, all variables and given/known data
    Hey people, I'm in dire need of help for this question.
    Say you are given a list of wavenumbers (eg. 80, 90, 100, 110 cm^-1) for rotational transitions, and you are asked to assign rotational quantum numbers J to the transitions, how would you do that?

    2. Relevant equations

    What I thought of is to use the equation V(J+1<--J) =2B(J+1) - 4D(J+1)^3
    Then divide by J+1 to make it a straight line plot. Then I know that the separation of the transitions is 2B = 10 cm^-1. Know, my tutor hinted us that we should start by guessing a value of J (ie. J=0, 1, 2, ...) and plot a graph until we got a straight line plot for a certain value of J, that would mean that transition corresponds to that value of J. I don't see what I need to do....

    3. The attempt at a solution
  2. jcsd
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