4. Differential Molecular Absorption Lidars (DIAL)
4.1 Physical principle of molecular absorption
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The description of molecular absorption is also based on the quantum representation of matter and light-molecule interactions. Unlike Raman scattering, which involves indirect transitions between ro-vibrational quantum levels, the absorption phenomenon involves direct transitions. The transition selection rules applying to the absorption phenomenon are also different, and can be written in 1 er order:
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Differential Molecular Absorption Lidars (DIAL)
Comparison of DIAL and Raman techniques
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