THE PRODUCTION OF NITRIC OXIDE IN SHOCK-HEATED AIR
AVCO EVERETT RESEARCH LAB INC EVERETT MA
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The rate of production of nitric oxide in shock-heated air was measured over the temperature range from 2300 K to 4500 K. The NO concentration was determined from the NO infrared emission in the 5.3 micron fundamental vibration-rotation band. The overall rate constant k k sub 2.k sub 4 for NO production was found to be 0.40 plus or minus 0.12 of the rate constant compiled by Wray. The rate constant for the bimolecular reaction N2O2 yields 2NO was found to be less than one-tenth the value suggested by Freedman and Daiber. In order to explain the disagreement in the rate constant, experiments were performed in shock-heated nitric oxide where the depletion of nitric oxide and the reaction products were observed. It was found that the NO depletion occurs mainly via the reaction 2NO yields N2O0. An analysis of the vibrational relaxation of NO-O2-N2 mixtures is presented and it is shown that NO vibration lag is small and does not affect the data analysis. It is also shown that corrections due to the shock tube boundary layer must be included in order to obtain detailed agreement between experiment and calculations. The procedure for correcting chemical measurements for shock tube boundary layer growth is outlined.
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy