Degrees of Freedom

The vibrational spectra of most molecules is very complex. We considered how additional lines arise in diatomic spectra including isotopic substitution and "hot bands". There are many more vibrational modes available to polyatomic molecules. How many? 3N-6!

MP3 podcast
screencast

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Check out the vibrational modes of CO₂ at Purdue's site. You need CHIME for this.
Animations of infrared vibrational modes.
and more animations