Question
State the necessary condition for a molecule to show i) a rotation spectrum and ii) a vibrational spectrum
Answer :
Word Count : 224
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(a). A pure rotation spectrum can only arise when the molecule possesses a permanent electric dipole moment. Like with vibrational spectroscopy, the physical effect that couples to photons is a changing dipole moment. Since molecular bond lengths remain constant in pure rotation, the magnitude of a molecule's
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