POLARITY
Only vibrations that cause a change in ‘polarity’ give rise to bands in IR spectra.
Which of the vibrations for CO2 are infrared active?
Symmetric stretch
Asymmetric stretch
Bending (doubly degenerate)
Two types of stretching vibrations
Symmetric stretch
Asymmetric stretch
Four types of Bending Vibrations
¨Scissoring
¨Rocking
¨Twisting
¨Wagging
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