A shock tube study of H + HNCO → NH2 + CO

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Abstract
The reaction of atomic hydrogen with isocyanic acid (HNCO) to produce the amidogen radical (NH2) and carbon monoxide, equation image has been studied in shock‐heated mixtures of HNCO dilute in argon. Time‐histories of the ground‐state NH2 radical were measured behind reflected shock waves using cw, narrowlinewidth laser absorption at 597 nm, and HNCO time‐histories were measured using infrared emission from the fundamental v2‐band of HNCO near 5 μm. The second‐order rate coefficient of reaction (2(a)) was determined to be: cm3 mol−1 s−1, where f and F define the lower and upper uncertainty limits, respectively.An upper limit on the rate coefficient of equation image was determined to be:
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