considering a diatomic molecule as the vibrating rotor, write the selection rule.
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For a rigid rotor diatomic molecule, the selection rules for rotational transitions are ΔJ = +/-1, ΔMJ = 0 . ... For real molecules like the example of HCl , the successive transitions are a bit lower than predicted because centrifugal distortion lengthens the molecule, increasing its moment of inertia.
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