Shock-tube measurement of the rate constant for excited hydroxyl(A2.SIGMA.+) formation in the hydrogen-oxygen reaction

摘要: H/sub 2/-O/sub 2/ mixtures highly diluted with Ar were heated to temperatures in the range 1200 3200/sup 0/K behind reflected shock waves. The intensity and temporal variation of emission from OH* A/sup 2/..sigma../sup +/-X/sup 2/II transition studied order determine reaction rate constant for formation. was found be formed mainly by H + O M = under experimental conditions below 2000/sup 0/K; thermal made significant contributions at higher temperatures. k/sub 1/ 1.2 x 10/sup 13/exp(-6940 cal/RT) cm/sup 6/mol/sup -2/s/sup -1/. This expression accounts its variation, including ignition delay times t/sub m/ 5/, used.