Vibrational spectra of complex molecules

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Presentation transcript:

Vibrational spectra of complex molecules Lecture 6 Vibrational spectra of complex molecules

R-Q-P

Gas Solid matrix Sharp peaks!

Liquid acetone Acetone in a solid matrix (*- admixtures) Sharp peaks!

Fermi 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.

Overtone Fundamental band Fermi Resonance