The rate constant for the NH 3 ϩ NO 2 L NH 2 ϩ HONO reaction (1) has been kinetically modeled by using the photometrically measured NO 2 decay rates available in the literature. The rates of NO 2 decay were found to be strongly dependent on reaction (1) and, to a significant extent, on the secondary reactions of NH 2 with NO x and the decomposition of HONO formed in the initiation reaction. These secondary reactions lower the values of k 1 determined directly from the experiments. Kinetic modeling of the initial rates of NO 2 decay computed from the reported rate equation,
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