Absolute rate parameters for the reaction of atomic hydrogen with hydrazine

Abstract

Absolute rate parameters for the reaction of atomic hydrogen with hydrazine H+N₂H₄→H₂+N₂H₃ have been determined in a direct manner using flash photolysis of dilute mixtures of hydrazine in helium and time dependent observation of H via resonance fluorescence. By measuring the H‐atom decay under pseudo‐first‐order conditions, the bimolecular rate constant k₁ was obtained over the temperature range 228–400°K. The data were fitted with good linearity to the Arrhenius expression k₁= (9.87±1.17) ×10⁻¹² exp(−2380±100/RT) cm³ molecule⁻¹⋅sec⁻¹. The data were shown to be free of any contributions from secondary reactions involving H as a reactant or product. A comparison of the present results with those from previous studies employing discharge flow methods is presented.