Complex-forming bimolecular reactions of metastable NH(a1Δ) with H2O(X?1a1) and H2O2(X?1A)

Article abstract of DOI:10.1002/bbpc.19971010330

The elementary reactions: NH(a¹Δ) + H₂O(X?) → products NH (a¹Δ, v) + H₂O₂ (X?) → products were studied in a quasistatic laser photolysis cell at a pressure of 20 mbar in the temperature range 295 ≤ T/K ≤ 523 and at room temperature respectively. NH(a¹Δ,v) was produced by excimer laser photolysis of HN₃(X?) and detected by laser-induced fluorescence (LIF). A variable delay time between photolysis and detection pulse brought about the time resolution. The NH(a) depletion yielded the following rate constants: k₁(T) = (3.5±0.8)10¹³(T/295 K)^-(1.5±0.2) cm³/mol s k₂(v = 0) = (7.5 ± 1.4) 10¹³ cm³/mol s k₂(v= 1) = (7.1 ± 0.9)10¹³cm³/mol s The reaction products of reaction (1) are NH₂(X?) + OH(X). For reaction (2) NH₂(X?) radicals were detected (24%); the quenching channel was found to be unimportant k_q<7.5·10¹¹ cm³/mols. The reaction mechanism is discussed. The reaction NH(a) + H₂O(X?) is compared to the reaction NH(X) + H₂O(X?). VCH Verlagsgesellschaft mbH, 1997.