Line Mixing In Infrared Atmospheric Spectra

L. Larrabee Strow

doi:10.1117/12.975628

24 August 1988 Line Mixing In Infrared Atmospheric Spectra

L. Larrabee Strow

Proceedings Volume 0928, Modeling of the Atmosphere; (1988) https://doi.org/10.1117/12.975628
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

Abstract

The phenomenon of line mixing in infrared vibration-rotation spectra and its impact on atmospheric transmission and radiative transfer is discussed. Line mixing, which is often also termed line coupling, occurs when rotationally inelastic collisions cause transitions among overlapping spectral lines. These collisional transitions can produce, in extreme cases, an overall narrowing of the blended profile of the coupled lines and can dramat-ically lower the absorption in the wing of a vibration-rotation band. Laboratory spectra exhibiting line mixing in both Q-branch and R-branch spectra of CO₂ are examined. Methods for the calculation of line mixing in atmospheric spectra are discussed, including methods for dealing with temperature dependencies. Observations of line mixing in both limb and nadir viewing atmospheric spectra are presented.

Citation Download Citation

L. Larrabee Strow "Line Mixing In Infrared Atmospheric Spectra", Proc. SPIE 0928, Modeling of the Atmosphere, (24 August 1988); https://doi.org/10.1117/12.975628

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