18 April 2003 Measurement of rate constant for quenching CO2(0110) by atomic oxygen at low temperatures: reassessment of the population of CO2(0110) and the CO2 15-μm emission cooling in the lower thermosphere
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Abstract
The paper presents the first laboratory measurement of the rate constant for quenching the CO2(0110) state during collisions of CO2 molecules with O atoms at temperatures realized near the Earth's mesopause. The measurement was carried out with a hollow-cathode glow discharge in the temperature range 206-358 K. The measured values are significantly smaller than those commonly used in solving the non-LTE CO2 problem for the vibrational states of the mode ν2 in the atmospheres of the Earth, Venus, and Mars. The measured temperature dependence of the rate constant is approximated by a simple relation, which is recommended for solving the above problem. The value of this rate constant is absolutely critical to remotely sense temperature, and hence also constituent densities, in the upper mesosphere and lower thermosphere of the Earth. The use of the new values of the rate constant significantly decreased the rate of cooling by the CO2 15-μm emission in the terrestrial lower thermosphere as compared to the previous estimates obtained for this rate. Over the most area of the Earth's surface, the maximum cooling rate occurs at an altitude of about 110 km and amounts to about 20 K/day.
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Gustav M. Shved, Gustav M. Shved, Lyudmila E. Khvorostovskaya, Lyudmila E. Khvorostovskaya, Igor Yu. Potekhin, Igor Yu. Potekhin, Vladimir P. Ogibalov, Vladimir P. Ogibalov, Tatyana V. Uzyukova, Tatyana V. Uzyukova, } "Measurement of rate constant for quenching CO2(0110) by atomic oxygen at low temperatures: reassessment of the population of CO2(0110) and the CO2 15-μm emission cooling in the lower thermosphere", Proc. SPIE 4882, Remote Sensing of Clouds and the Atmosphere VII, (18 April 2003); doi: 10.1117/12.463371; https://doi.org/10.1117/12.463371
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