Assessment of spontaneous lifetimes in CO/sub 2/ using an HF laser as radiation source

We have experimentally determined the absorption coefficient of CO/sub 2/ using the 3P(2) line emitted by an HF laser, as a function of the gas temperature up to 700/spl deg/K, while keeping its pressure as a parameter. The measurements were compared with a theoretical model for the absorption which takes into account the high monochromaticity of the source and the detuning of the HF laser lines with respect to the CO/sub 2/ absorption lines central wavelengths. A set of values was thus obtained for the A Einstein coefficient of the transitions given by (O O/sup 0/0)/spl rarr/(O 2/sup 0/1; 1 1/sup 1/ 1)/sub I,II/, (10/sup 0/ O; O 2/sup 0/ O)/sub I,II//spl rarr/(O 4/sup 0/1; 1 2/sup 0/1; 2 O/sup 0/1)/sub I,II,III/ and (01/sup 1/ O)/spl rarr/(1 1/sup 1/ 1; O 3/sup 1/ 1)/sub I,II/, in such a way that said values allowed, the coincidence between the experimental results and those predicted by the theoretical model.<>