Kinetics of Reaction Between Mu and Ni²⁺ in Superheated Water

Abstract

Rates of spin exchange of muonium with Ni²⁺ in sub and supercritical D₂O were investigated using muon spin spectroscopy (µSR).  The procedure for determining rate constants of muonium reactions is described.  Then, results for the reaction of muonium with Ni²⁺ in D₂O are compared to previous data obtained for Ni²⁺ in H₂O.  The rate constants are presented as functions of temperature, pressure, viscosity and density to explore possible contributions to the solvent isotope effects.