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- W2023631386 abstract "The rate of disappearance of OH following [OH]max in shocked H2–O2–Ar mixtures has been measured by a refined ultraviolet line absorption technique. Thirty‐one experiments have been done with mixtures of 4% H2, 1% O2, 95% Ar; 2% H2, 0.5% O2, 97.5% Ar; and 8% H2, 1% O2, 91% Ar at initial pressures between 50 and 200 mm Hg. The approximate rate equation found to describe the OH disappearance is −d[OH]/dt=kapparent[OH]2[M], where [M] is total gas concentration. Assuming that the equilibrium relationship α=[OH]/[H]=K[H2O]/[H2] is maintained, and that the recombination reactions are: H+H+M→ lim k1H2+M, and H+OH+M→ lim k2H2O+M,kapparent may be interpreted as (A/α) (k1+αk2) where A is a factor near unity which incorporates the definitions of the k's as volumetric rate coefficients, the small variation of α and density during the reaction, and the participation of O and O2. (k1+αk2) increased linearly with α between α=0.01 and α=0.1, yielding k1=6±1×108 liter2 mole—2·sec—1 and k2/k1≈10±5. No dependence on temperature was evident. Estimation of the contributions of H2, H, and H2O as third bodies indicates that k1Ar=4±2×108 liter2 mole—2·sec—1 near 1700°K." @default.
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- W2023631386 date "1964-11-01" @default.
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- W2023631386 title "Kinetic Studies of Hydroxyl Radicals in Shock Waves. IV. Recombination Rates in Rich Hydrogen—Oxygen Mixtures" @default.
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