Lecture 5 Vibrational Spectra of Simple Molecules.

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Presentation transcript:

Lecture 5 Vibrational Spectra of Simple Molecules

Diatomic Molecules Rotations Reduced mass Moment of inertia Convenient units: cm -1 To convert, we divide energy in joules by 100hc × For I =1 (a.e.×Å 2 ) B=16.9 cm -1

Related thermal population of rotational levels in CO molecule at room temperature

Vibrations of Diatomic Molecules

Temperature dependence of spectra Lactose IR Raman CCl cm -1 Freeze it!

CO 2