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

AI Thread Summary
To assign J''-J' values from a specific line in the rotational spectrum given only the energy value in cm-1, it is crucial to understand the selection rules, which state that J can change by +/- 1 during transitions. However, without additional information such as the rotational parameter B or the identity of the molecule, accurately identifying the J values is challenging. The energy value alone is insufficient for precise assignment, as multiple J''-J' transitions could correspond to the same energy level. Further context about the molecule and its rotational constants would be necessary for a definitive assignment.
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?
 

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