文档介绍：IR Spectroscopy
Wave length ~ 100 mm to 1 mm
Wave number ~ 100 to 10,000 cm-1
Frequency ~ 3 x 1012 to 3 x 1014 Hz
Energy ~ 1 kJ to 100 KJ /mole
HCl absorptions
cm-1 fundamental band strong
cm-1 first overtone weak
cm-1 second overtone
cm-1 third overtone
cm-1 fourth overtone
Potential Energy Curve
V(r)
r
Harmonic Approximation
Vibration of a diatomic molecule
m1
m2
Centre of mass
does not move!
Quantum Mechanics of vibration
Must have an oscillating dipole moment
Selection Rule
Transition Moment = Integral
Transition Moment Integral
Initial state
Final
state
Morse Potential