Temperature dependence of the absorption in the region beyond the 43-μm band head of CO_2 2: N_2 and O_2 broadening

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In this paper we present the first accurate determination, from laboratory measurements, of the temperature dependence of CO2 continuous absorption beyond the ν3 band head, with N2 and O2 as perturbers. The χ form factors previously published have been tested and optimized, and new form factors are proposed. It has been clearly demonstrated for N2, as well as for O2 broadening, that a χ factor independent of T in the range 193 ≤ T ≤ 300 K gives calculated values of the absorption coefficient in fair agreement (±20% level) with observed values in the spectral region 2400 < σ < 2500 cm−1.