The absorption of carbon dioxide-nitrogen mixtures at 4.40 µ was examined over a temperature range of 1200 to 2100°K for optical densities of 0.10 to 0.40 atm-cm. The test gas was elevated to desired temperatures by shock compression. Properties of the test gas were determined by measurement of initial concentrations and shock wave velocities. Absorption was observed as a diminution of source beam intensity monitored with a rapid response infrared detector and displayed on an oscilloscope. Beer's law was found to be applicable over the range of temperature and concentration studied. Absorption coefficients calculated from Beer's law plots reached a maximum of 3.0 atm—1 cm—1 at about 1400°K, and were independent of total pressure from 0.26 to 1.05 atm. The absorption was also measured over a wavelength interval of 4.37 to 4.6 µ. The results of this investigation are compared to the existing theoretical and experimentally determined absorption data.
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