Measurement of rate constant for quenching CO_2(010) by atomic oxygen at low temperatures: reassessment of the population of CO_2 (010) and the CO_2 15-μm emission cooling in the lower thermosphere

摘要

The paper presents the first laboratory measurement of the rate constant for quenching the CO_2(01~10) state during collisions of CO_2 molecules with O atoms at temperatures realized near the Earth's menopause. 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 CO_2 problem for the vibrational states of the mode v_2 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 CO_2 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.