Temperature dependence of the diffusion and accommodation coefficients in nitrous oxide and carbon dioxide excited into the (00°1) vibrational level

We have studied the temperature dependence of the relaxation rates in nitrous oxide and carbon dioxide excited into the (00°1) level by absorption of the radiation of a Q-switched laser. The relaxation constant β has been determined by measuring the decay time of the fluorescence emitted by the gas. Measurements were performed in the temperature range between room temperature up to 1000 °K and at gas pressures low enough to determine the diffusion coefficient of the excited molecules and their wall-deexcitation probability versus temperature.