Calculation of the Absorption Coefficient of Ar-Broadened CO₂ in the 4.3 μm Band Wing on the Basis of Asymptotic Line Wing Theory

Carbon dioxide absorption broadened by argon is studied on the basis of the asymptotic line wing theory. The line shape parameters concerned with the classical potential, which governs the center-of-mass motion, and the quantum intermolecular interaction potential are found. The temperature dependence of the CO₂–Ar absorption beyond the 4.3 μm band edge is explained through changes in the classical potential, which describes the temperature behavior of the second virial coefficient in the temperature region under study.