Q-branch shapes of CO2 spectrum in 15 μm region: experiment.

Physics

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Carbon Dioxide: Infrared Spectra, Carbon Dioxide: Laboratory Spectra

Scientific paper

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 0.002 cm-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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