Lecture 6 Vibrational spectra of complex molecules.
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Lecture 6 Lecture 6 Vibrational spectra of complex molecules
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Transcript of Lecture 6 Vibrational spectra of complex molecules.
Lecture 6Lecture 6
Vibrational spectra of complex molecules
R-Q-P
Gas
Solid matrix
Sharp peaks!Sharp peaks!
Liquid acetone
Acetone in asolid matrix(*- admixtures)
Sharp peaks!Sharp peaks!
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.
Fermi Resonance
Overtone
Fundamental bandFundamental band
