Scavenging of ions in irradiated organic liquids

The kinetics of positive ion and electron scavenging in certain n-alkanes, cycloalkanes, branched alkanes, aromatic hydrocarbons and in some polar compounds (ethers, dimethylformamide) have been investigated. The non-homogeneous kinetic approach gives satisfactory agreement with experimental results for n-hexane, cyclohexane, iso-octane and 2,3-dimethylbutane. Differences between positive ion and electron scavenging for ethers have been observed and ascribed to the complex structure of the corresponding positive ions. For benzene and dimethylformamide the homogeneous kinetic equation gives the best agreement with experimental results. Characteristic parameters such as Gsub(fi), Gsub(gi), reactivity coefficients α, rate constant of ion scavenging ksub(s), geminate recombination parameters for several solvents lambda, and the most probable distances of electron thermalization have been determined or calculated. The effect of molecular structure on the ionic reactions has been discussed. (author)