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Proceedings Paper

Line Mixing In Infrared Atmospheric Spectra
Author(s): L. Larrabee Strow
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Paper 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.

Paper Details

Date Published: 24 August 1988
PDF: 19 pages
Proc. SPIE 0928, Modeling of the Atmosphere, (24 August 1988); doi: 10.1117/12.975628
Show Author Affiliations
L. Larrabee Strow, University of Maryland Baltimore County (United States)

Published in SPIE Proceedings Vol. 0928:
Modeling of the Atmosphere
Laurence S. Rothman, Editor(s)

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