Method of Computing the Deviation from Kirchoff'S Law in the Mesosphere for the Transfer of Radiation in the 15-Micron Band of Carbon Dioxide

摘要

The ideal structure of the absorption band, as used by Curtis and Goody in the calculation of the radiative heating due to the 15 micron CO2 band, may result in large errors. Accurate calculations require a knowledge of the real structure of the band as well as the replacement of the usual relaxation equation by the system of gas-kinetic equations. The probabilities of nonelastic collisions, taking into account Fermi resonance, are computed. The vibrational relaxation time of CO2 in dry air at 200 degrees K and 1 atm pressure is expected to fall within the interval 2--20 x 10 to the -6th power sec. The contribution of water vapor to the relaxation time of CO2 is discussed. (Author)