Vibrational Relaxation of CO2 in Expanding Flows.
Final technical rept. 1 May 67-31 Dec 71,
CORNELL AERONAUTICAL LAB INC BUFFALO N Y
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Vibrational relaxation of CO2 with Ar, N2, and CO and the vibrational relaxation of pure CO have been studied in shock-tube driven, quasi-steady supersonic expansion flows in a two-dimensional wedge nozzle. The experiments were conducted over a range of reservoir temperatures of about 2500K to about 4000K and at a reservoir pressure of about 20 atm. The diagnostic technique was based on quantitative measurements of infrared radiation from CO2 and the CO fundamental vibration-rotation band. The results indicate that the vibrational relaxation of COv3 in the expansion flows proceeds at a rate nearly that obtained from shock wave studies. The efficiency of argon in deexciting CO2 vibration is estimated. CO is found to relax vibrationally about two orders of magnititude faster than anticipated on the basis of shock-wave results. The results of COCO2 mixtures indicate strong coupling of the vibrational deexcitation of these species. Author
- Lasers and Masers
- Atomic and Molecular Physics and Spectroscopy