Reaction rates of the reactions of OH(X 2Π) with NH(a 1Δ) and HN3(X̃)

The rate constants of the radical–radical reaction OH(X 2Π)+NH(a 1Δ)→products and the radical–molecule reaction OH(X 2Π)+HN3→products were determined in a quasistatic laser photolysis cell at room temperature and a total pressure of 20 mbar. The radicals OH(X 2Π) and NH(a 1Δ) were generated by exciplex laser photolysis of H2O2 and HN3, respectively and detected by laser-induced fluorescence. The fluorescence time profiles of these radicals were monitored at variable delay times between photolysis and detection pulses and thus time resolution was obtained. The measurements yielded the rate constants k1=(7.0±2)×1014 cm3 mol−1 s−1 and k2=(7.7±1)×1011 cm3 mol−1 s−1.