State and briefly explain the gross selection rule required for a molecule to give a pure rotational spectrum. What is the physical origin of the specific selection rule ΔJ = ±1?
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(i) State and briefly explain the gross selection rule required for a molecule to give a pure rotational spectrum. What is the physical origin of the specific selection rule ΔJ = ±1?
(ii) Explain how the bond length of a diatomic molecule may be determined from the measured spacing between the lines observed in its microwave spectrum
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