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Proceedings Paper

Relaxation processes of vibrationally excited species in the mesosphere and thermosphere
Author(s): Valerie I. Lang
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Paper Abstract

A critical review of rate constants for collisional relaxation processes and spontaneous emission processes in the non-LTE environment between 50 and 300 km is in progress. The infrared radiators considered are CO, H2O, O3, NO, CO2, OH and CH4. The last major compilation of vibrational relaxation rates relevant to the atmosphere was published by Taylor in 1974. The advent of laser-induced fluorescence techniques during the past two decades has greatly improved the state of knowledge regarding level specific collisional deactivation processes. Additionally, improved measurements of the rovibrational band strengths for H2O, O3 and CH4 have resulted in improved Einstein A coefficients for these species. The rate constants under review are important parameters in models used to predict the dissipation of radiation entering the Earth's atmosphere as sunshine or energetic electrons. They are fundamental quantities in background radiance calculations. The effect of revising the rate coefficients has been illustrated using the Strategic High- Altitude Atmospheric Radiance Code (SHARC 2.0).

Paper Details

Date Published: 21 September 1992
PDF: 9 pages
Proc. SPIE 1687, Characterization, Propagation, and Simulation of Sources and Backgrounds II, (21 September 1992); doi: 10.1117/12.137841
Show Author Affiliations
Valerie I. Lang, The Aerospace Corp. (United States)


Published in SPIE Proceedings Vol. 1687:
Characterization, Propagation, and Simulation of Sources and Backgrounds II
Dieter Clement; Wendell R. Watkins, Editor(s)

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