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  Rotational Raman Spectroscopy
The Raman Effect page 1 of 4
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
  Quantum Theory of Raman effect

As a stream of photons collides with a particular molecule the photons will be deflected without change in energy if collisions are perfectly elastic. If energy is exchanged between photon and molecule, the collision is said to be inelastic. The molecule can gain or lose discrete amounts of energy in accordance with quantal laws - the energy must coincide with a transition between two molecular energy levels.

The Classical Raman Effect

The distortion of a molecule in an electric field is determined by its polarisability . If the strength of the field is , in addition to any dipole moment it may already have the molecule acquires an additional dipole moment:

_ = (3)
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