Discussion
The symmetric stretch of carbon dioxide is infrared inactive because it involves no change in the
Answer: D
Correct answer: dipole moment
Infrared absorption requires the vibration to change the molecule’s dipole moment, since it is that oscillating dipole that couples to the electric field of the radiation. In the symmetric stretch of carbon dioxide both oxygen atoms move outward together, so the two bond dipoles remain equal and opposite and the net dipole stays zero throughout. The mode is therefore infrared inactive - though it is Raman active, since the polarisability does change.
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