Abstract
The kinetics of the reaction N(/sup 2/D,/sup 2/P) + NO/sub 2/ were studied by using moderated nuclear recoil atoms to generate thermalized metastable atomic nitrogen, /sup 2/D and /sup 2/P, at a (NO/sub 2/)/(N) ratio of 10/sup 13/. Branching ratios were obtained for the following channels of reaction: N + NO/sub 2/ ..-->.. N/sub 2/O + O (k/sub 1a/); N + NO/sub 2/ ..-->.. 2NO (k/sub 1b/); N + NO/sub 2/ ..-->.. N/sub 2/ + O/sub 2/ (k/sub 1c/); N + NO /sub 2/ ..-->.. N /sub 2/ + 20 (k/sub 1d/). The distribution of channels 1a:1b:(1c + 1d) was measured to be 1.00:0.65:0.27. An upper limit for the overall rate constant for reaction was also evaluated at 3.3 x 10/sup -13/ cm/sup 3/ molecule/sup -1/s/sup -1/ (293 K) by using competitive kinetic measurements of the formation of radioactive nitrogen-13 labeled products. This rate constant is at least an order of magnitude smaller than previously reported values for the ground-state N(/sup 4/S) + NO/sub 2/ reaction.
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