Abstract
The oxidation of CO was investigated at reduced pressure (49–76 torr) in a flat flame arrangement. Using quantitative infrared emission spectroscopy relative populations of different vibrational energy levels of the CO 2 molecule were determined at different heights above the flame front. Strong deviations from equilibrium Boltzmann distribution were observed for different vibrational modes leading to population inversion. The results can be explained in terms of specific excitation of the bending mode of the CO 2 product molecule in the reaction and of the pronounced difference in relaxation times for the different vibrational modes.
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