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~. Because of the sensitivity of the diagnostic system, very low reactant concentrations could be employed in order to reduce the influence of secondary reactions on the NH~2~ profiles. Benzylamine, C~6~H~5~CH~2~NH~2~, was used as a thermal source of the NH~2~ radicals in the experiments. To determine the reaction rate, a perturbation strategy was employed that is based on changes in the NH~2~ profiles when NO is added to the C~6~H~5~CH~2~NH~2~/Ar mixtures. The measured NH~2~ profiles were interpreted by detailed kinetic modeling to obtain the overall reaction rate of R1 in the temperature range 1262–1726 K. The lower temperature limit of the present study is in the middle of the Thermal De‐NOx temperature window. The present rate measurements are consistent with both our previous determination of the rate at higher temperatures and lower temperature data. A rate expression obtained by combining our higher temperature data and lower temperature data is
k~1~ = 6.83 × 10^15^ T^−1.203^ e^106/T (K)^ cm^3^ mol^−1^ s^−1^
for the temperature range 200–2500 K. The estimated uncertainty of the rate coefficient is ±20%. © 2001 John Wiley & Sons, Inc. Int J Chem Kinet 33: 715–721, 2001