Abstract

The sensitivity of molecular vibrational population dynamics, governing the COlaser operated in fundamental and overtone transitions, to vibration-to-vibrationrate constants is investigated. With this aim, three rate constant sets have beenused, differing in their completeness (i.e. accounting for single-quantumexchange only, or for multi-quantum exchange with a limited number of rateconstants obtained by semiclassical calculations, and, finally, with anexhaustive set of rate constants including asymmetric exchange processes,as well) and in the employed interaction potential. The most completeset among these three is introduced in this paper. An existing earlierkinetic model was updated to include the latter new data. Comparison ofdata produced by kinetic modelling with the above mentioned sets ofrate constants shows that the vibrational distribution function, and, inparticular, the CO overtone laser characteristics, are very sensitive to thechoice of the model. The most complete model predicts slower evolution ofthe vibrational distribution, in qualitative agreement with experiments.

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