Reactions of thermal energy ions. Part 3.—Ion–molecule reactions in H2O and D2O

Abstract

The formation of H₃O⁺ in the high-pressure mass spectrum of H₂O and, similarly, the formation of D₃O⁺ in D₂O are the result of the ion molecule reactions, H₂O⁺+H₂O→H₃O⁺+OH (1) OH⁺+H₂O→H₃O⁺+O (2) D₂O⁺+D₂O→D₃O⁺+OD (3) OD⁺+D₂O→D₃O⁺+O. (4) The thermal rate constants, measured directly by a pulsing technique, are k₁= 4.9₃×10^–10, k₂= 4.7₂×10^–10, k₃= 3.6₆×10^–10 and k₄= 2.2₅×10^–10, all in cm³ molecule^–1 sec^–1.