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  Rotational Raman Spectroscopy
Introduction page 2 of 3
Practical Navigator
The Raman Effect
Experimental Techniques
1. Rotational Raman Spectroscopy
Interpreting the Spectrum
Effect of Bond Length
Centrifugal Distortion
Intensities of Spectral Lines
Nuclear Spin Statistics
2. Real Diatomic Molecules
Spectrum of Nitrogen
Isotopic Substitution
Nuclear Spin Statistics
Predict the Spectrum of Oxygen
  You must be able to convert energy and frequency, but often spectroscopists are more interested in working with numbers which span a reasonable range, rather than always working in energy or frequency. In IR and Raman, the spectroscopic transition energies are generally quoted in wavenumber units.

Wavenumbers are the inverse of the wavelength 1/.

Because of the energies involved, it is generally most convenient to quote typical IR spectroscopic transitions in cm rather than m.

When a beam of light is passed through a transparent substance, a small amount of the radiation energy is scattered, the scattering persisting even if all dust particles or other extraneous matter are rigorously excluded from the substance. If monochromatic radiation is used the scattered energy will consist almost entirely of radiation of the incident frequency.
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