A possible classification of the rate constant ratios of some positronium and muonium reactions with inorganic compounds in water

Abstract

The reaction rate constants in aqueous solutions of some inorganic compounds with the orthopositronium atom (o-Ps) were measured or checked in order to compare the o-Ps rate constants, K(Ps), with those of the muonium atom. K(Mu). It was confirmed on a larger experimental background that the ratio r between K(Mu) and K(Ps) can vary by factors of 10 and evidence was found that its value depends on the reaction types. In particular r seems to be <2 for redox reactions and >2 for spin exchange and addition reactions.