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Fast Reactions of Atom Substitution from Polyatomic Molecules and Solid Salts by Thermally Equilibrated Atomic Reactants

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Abstract

A new class of fast thermal gas-phase reactions of the direct substitution of atoms in polyatomic molecules by atomic reactants is discovered. The Arrhenius parameters are determined for the reactions of atomic deuterium with a number of hydrogen-containing compounds, occurring via the direct substitution of hydrogen atoms and via the abstraction of hydrogen atoms. Fast substitution of alkali metal atoms from the crystals of their salts for the reaction chain carriers of hydrogen flames is found. The importance of reactions of these types in chain combustion is demonstrated. The kinetic isotope effects of hydrogen atom abstraction from hydrocarbon molecules by hydrogen and deuterium atoms are studied. A method for the kinetic studies of free atoms and radicals is developed, which takes into account the role of longitudinal diffusion in the jet and does not require the knowledge of the concentrations of atoms and radicals or the rate constants of other reactions.

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  1. Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    V. V. Azatyan

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Azatyan, V.V. Fast Reactions of Atom Substitution from Polyatomic Molecules and Solid Salts by Thermally Equilibrated Atomic Reactants. Kinetics and Catalysis 43, 149–164 (2002). https://doi.org/10.1023/A:1015338507684

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