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

AI Thread Summary
The discussion focuses on assigning J values for the P and R branches of various HCl and DCl isotopes. The user expresses confusion about how to properly assign these values, noting that R branches can start at 0 while P branches begin at 1. They mention having conducted IR spectroscopy and identifying wave numbers, but struggle with the transition from these numbers to J values. The user also highlights the distinction in peak intensities related to isotopes and seeks clarification on the difference between J and J' values. Understanding these assignments is crucial for accurate interpretation of spectral data.
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Homework Statement


Assign J values for P and R branches of H35cl, H37cl, d35cl, and d37cl compounds.


Homework Equations





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.
 
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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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