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Homework Help: [P CHem] HCL/DCL r and p branch J value assignment

  1. Feb 11, 2013 #1
    1. The problem statement, all variables and given/known data
    Assign J values for P and R branches of H35cl, H37cl, d35cl, and d37cl compounds.

    2. Relevant equations

    3. The attempt at a solution
    I have a fundamental IR spectra I did on and HCL/DCL compound. I'm extremely confused how to assign J values. I've been looking online and see R can be 0, 1, 2, 3, etc but P starts at 1,2,3, etc. How did they assign these values?

    What I do know
    I peaked picks so I know the wave numbers.
    I can tell the P branch form the R because as the wave numbers get smaller they get more spread out.
    I know the less intense peaks of the doublets are the H37CL or D37CL b/c it is a less common isotope and intensities are based on number of species.
  2. jcsd
  3. Feb 12, 2013 #2
    I'm stuck here too! How do you go from wave numbers to j values. What's the difference between j and j'?
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