Abstract
The vibrational relaxation characteristics of shock-heated CO2 have been studied using a tuned CO2 laser absorption technique. Absorption-coefficient histories were obtained for a single rotational state in each of the 10°0 and 02°0 levels over the temperature range from 500 to 2000°K, and for 21 rotational states of the 10°0 level at 1000°K. These histories have been combined with translational-rotational temperature histories based on interferometer measurements to calculate vibrational relaxation times for the bending mode. The results verify the mutual equilibrium of the bending and symmetric-stretch modes due to Fermi resonance. The bending mode relaxation times are approximately 10% shorter than predicted from interferometer results using the ratio of specific heats. Furthermore, relaxation times based on measurements of different rotational states at 1000°K show a variation with quantum number J, indicating a possible rotational nonequilibrium during the vibration relaxation process.
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