How to Assign J''-J' Values in Rotational Spectrum with Only Energy Value?

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jl29488
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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?
 
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I don't think it is possible to assign anything to just a single line.
 
jl29488 said:
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?
Do you know what the molecule is?