Is it possible to find out the relative concentration of c02 by looking at the emission or absorption from a hot gas, T = 1000K, containing among other C02? What I want to find out is if the emission depends linearly on the concentration. (in the IR region) What theoretically equations may I used to find this out? I have been looking at literature of Radiative transfer but I do see how this can be possible. I have data from the hitran database (giving wavelength, intensity (or equivalent width), Einstein coeff, statistical weights, FWHM, lower level energy and such) Does anyone know?