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Sanjay 1 Best Answer
Each of the normal modes of vibration of heteronuclear diatomic molecules in the gas phase also contains closely-spaced (1-10 cm difference) energy states attributable to rotational transitions that accompany the vibrational transitions. A molecule’s rotation can be affected by its vibrational transition because there is a change in bond length, so these rotational transitions are expected to occur. Since vibrational energy states are on the order of 1000 cm, the rotational energy states can be superimposed upon the vibrational energy states. according to born open heimmer aprroximation each electronic level contains many of the vibrational level and each vibrational level contains many of the rotational level ...
still didn't get ?
but ir is a vibrational type of spectroscopy n?
did you get it ??? if yes then kindly accept my answer