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# Vibration analysis

Vibrational analysis is based on the finite difference approximation. Different information can be obtained from this:

- Vibrational modes
  - `Vibrations`
  - Example
  - Old calculations
  - Vibrational Data
- Infrared intensities
  - `Infrared`
- Resonant and non-resonant Raman spectra
  - 1. Finite difference calculations
- Evaluation of Franck-Condon factors
  - Franck-Condon factors in CH4