The shapes of Q-branches in CO2 spectra in the 580–850 cm−1 region for pure gas and mixtures CO2---He and CO2---Ar have been studied at resolutions up to 0.002cm−1. The branch broadening coefficients were measured in the pressure range from a few torr to 50 atm. Those for 11102-02201 Π-Δ transition are different for pressures below and above 5 atm. At higher pressures the branch broadening coefficients are similar for all Q-branches. The observed Q-branch shape transformation is explained by line mixing effects.
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