Abstract
The rate coefficient of the reaction NH 2 +NO→products (R1) was determined in shock tube experiments using frequency modulation absorption spectroscopy for detection of NH 2 . Due to the sensitivity of the diagnostic system, very low reactant concentrations could be employed to reduce the influence of secondary reactions on the NH 2 profiles. The source of the NH 2 radicals in the experiments was the thermal decomposition of CH 3 NH 2 . To determine k 1 , a perturbation strategy was employed that is based on changes in the NH 2 profiles when NO is added to the CH 3 NH 2 /Ar mixtures. Analysis showed that NH 2 profiles in the CH 3 NH 2 /NO/Ar mixtures were sensitive primarily to reaction R1, with significantly lower sensitivity to the branching ratio and other NH 2 reactions. The measured NH 2 profiles were interpieted by detailed kinetic modeling to obtain k 1 values in the temperature range 1716–2507 K. The present, k 1 values are consistent with recent theoretical results of Miller and coworkers. There is no evidence for a positive activation energy for this reaction at elevated temperatures as report in several other high-temperature experimental studies. Combining the present high-temperature data with lower temperature determinations yields the following simple expression for the overall reaction rate. k 1 =2.08×10 16 T −1.34 cm 3 /mol s for the temperature range 300–2500 K.
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