The kinetics of the reaction N(2D,2P) + NO2 were studied by using moderated nuclear recoil atoms to generate thermalized metastable atomic nitrogen, 2D and 2P, at a [NO2]/[N] ratio of 1013. Branching ratios were obtained for the following channels of reaction: N + NO2 → N2O + O (k1a); N + NO2 → 2NO (k1b); N + NO2 → N2 + O2 (k1c); N + NO2 → N2 + 2O (k1d). 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 × 10-13 cm3 molecule-1 s-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(4S) + NO2 reaction.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry