- Antisymmetric and bending are IR active
- Use harmonic theory and mechanical models to describe the energy needed for bond deformation
Increases wavenumber
- Multiple bonds, smaller mass, stretching compared to benfing, assymetry compared to symmetry, polar bonds
Each bond corresponds to a wavenumber. Wavenumber is not affected by the presence of other atoms/ bonds
Regions
- 4000-1000 cm-1 --> Functional group
- 1300 - 1000 cm-1 --> Polymer fingerprint
- 1000-650 cm-1--> Ring region
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