The reaction of ammonia with nitrogen dioxide in a flow reactor: Implications for the NH2 + NO2 reaction

The NH₃/NO₂ system has been investigated experimentally in an isothermal flow reactor in the temperature range 850–1350 K. The experimental data were interpreted in terms of a detailed reaction mechanism. The flow reactor results, supported by a theoretical analysis of the NH₂? NO₂ complex, suggest that the NH₂ + NO₂ reaction has two major product channels, both proceeding without activation barriers: Our findings indicate that the N₂O + H₂O channel is dominant at low temperatures while H₂NO + NO dominates at high temperatures. The rate constant for reaction (R21) is estimated to be 3.5 · 10¹² cm³/mol-s in the temperature range studied with an uncertainty of a factor of 3. © 1995 John Wiley & Sons, Inc.     

Modes of periodic waveguides

We calculate exactly the two bound Floquet modes of a periodic linear waveguide induced in a medium by a second-order soliton of the nonlinear Schr?dinger equation. The modes are degenerate at the writing frequency, having the same quasi-propagation constant, which suggests applications of our method to spectral filtering.