High-temperature absorption by pure co2 far line wings in the 4 μm region

We present, for the first time, shock-tube measurements of the absorption of infrared radiation by pure CO2 near 4 μm up to the temperature of 1200 K. The experimental values are in good agreement with previous determinations up to 800 K. These results demonstrate the interesting point of this new measurement technic and the investigated temperature and pressure ranges are extended toward those of the combustion media. Comparisons with calculations confirm the strongly sublorentzian behavior of the far wings of CO2 absorption lines; the accuracy of previously published models based on empirical corrections to the Lorentzian profile is also shown.