Chapter 12 - Structure Determination: Mass Spectrometry And Infrared Spectroscopy Page 9

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The infrared absorption process
All the bonds in a molecule are not
capable of absorbing IR energy, even,
if the frequency of the radiation exactly
matches that of the bond motion.
Only those bonds that have a dipole
moment that changes as a function of
time are capable of absorbing the IR
radiation.
Thus, a symmetric bond which has identical or nearly identical groups on
each end will not absorb in the infrared.
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