1. Vibrational Spectra of Simple Molecules
Lecture 5
Vibrational Spectra of Simple Molecules

2. Diatomic Molecules Rotations Reduced mass Moment of inertia
Convenient units: cm-1
To convert, we divide energy in joules by 100hc
1.989 ×10-23
For I =1 (a.e.×Å2) B=16.9 cm-1

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

5. Vibrations of Diatomic Molecules

11. Freeze it! Lactose IR Raman CCl4 @460 cm-1
Temperature dependence of spectra
Freeze it!

14. CO2