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A shock tube study of the reactions of NH with NO,O2, and O
Authors:John D Mertens  Albert Y Chang  Ronald K Hanson  Craig T Bowman
Institution:High Temperature Gasdynamics Laboratory, Department of Mechanical Engineering, Stanford University, Stanford, California 94305
Abstract:The reactions of NH(X3Σ?) with NO, O2, and O have been studied in reflected and incident shock wave experiments. The source of NH in all the experiments was the thermal dissociation of isocyanic acid, HNCO. Time-histories of the NH(X3Σ) and OH(X2Π) radicals were measured behind the shock waves using cw, narrow-linewidth laser absorption at 336 nm and 307 nm, respectively. The second-order rate coefficients of the reactions: equation image were determined to be: equation image equation image and equation image cm3 mol?1 s?1, where ? and F define the lower and upper uncertainty limits, respectively. The branching fraction of channel equation image defined as k3b/k3total, was determined to be 0.19 ± 0.10 over the temperature range of 2940 K to 3040 K.
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