Calculation of CO₂ Absorptivity under Thermal Nonequilibrium Conditions in the Wave Number Range between 400 and 1200 cm^–1

A methodology is presented for calculating the absorption and emission characteristics of CO₂ in the range from 400 to 1200 cm^–1, taking into account the influence of thermal nonequilibrium. A series of calculations were carried out using the line-by-line (LBL) model and the statistical narrowband (SNB) model, which showed good agreement between each other. The technique agrees satisfactorily with experimental data. Non-equilibrium in rotational temperature has virtually no effect on the radiative characteristics, in contrast to translational and vibrational temperatures, the influence of which is significant.