Definition of kinetic cooling

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Photonics Dictionary

kinetic cooling: An atmospheric nonlinear process unique to CO₂ laser wavelengths, whereby CO₂ absorbs 10.6-µm radiation and the CO₂ molecules in the (100) vibrational state are excited to the (001) level, and transferred by collisions to the near resonant nitrogen vibrational level. The absorbed energy is stored; the lower (100) level is depleted and forced out of thermal equilibrium. Therefore, atmospheric temperature decreases after the absorption process.

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