Determinations of the rate constants of the reactions Cl + N3Cl and N3 + NO at 295 K

The kinetics of reactions involving the ground-state azide radical, N₃ (X²Π_g, have been investigated in a discharge-flow system using mass spectrometric detection with molecular-beam sampling. The following rate constants have been determined at 295 K: Cl + N₃Cl → Cl₂ + N₃,k₂₉₅ = (1.78 ± 0.26) × 10^?12 cm³ s^?1 (1σ): N₃ + NO → N₂O + N₂, k₂₉₅ = (1.19 ± 0.31) × 10.^?12 cm³ s^?1 (1σ). A method for determining absolute N₃ radical concentration is reported.