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Lecture 6 Lecture 6 Vibrational spectra of complex molecules

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Page 1: Lecture 6 Vibrational spectra of complex molecules

Lecture 6Lecture 6

Vibrational spectra of complex molecules

Page 2: Lecture 6 Vibrational spectra of complex molecules

R-Q-P

Page 3: Lecture 6 Vibrational spectra of complex molecules
Page 4: Lecture 6 Vibrational spectra of complex molecules

Gas

Solid matrix

Sharp peaks!Sharp peaks!

Page 5: Lecture 6 Vibrational spectra of complex molecules

Liquid acetone

Acetone in asolid matrix(*- admixtures)

Sharp peaks!Sharp peaks!

Page 6: Lecture 6 Vibrational spectra of complex molecules

Fermi ResonanceFermi Resonance

Overtone:weak (forbiden) Resonance line:

much stronger, shifted,and allowed

Two conditions must be satisfied for the occurrence of Fermi Resonance:(1) the two vibrational states of a molecule transform according to the same irreducible representation of the molecular point group.(2) The energies of the transitions (accidentally) have almost the same energy.

Page 7: Lecture 6 Vibrational spectra of complex molecules

Fermi Resonance

Overtone

Fundamental bandFundamental band

Page 8: Lecture 6 Vibrational spectra of complex molecules
Page 9: Lecture 6 Vibrational spectra of complex molecules
Page 10: Lecture 6 Vibrational spectra of complex molecules

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