Charged Species in Dielectric Liquids Generated by High Energy Radiation

摘要

The main subject of Part I of this thesis is the investigation of the kinetics of the geminate recombination of the charged species, in relation to the yield of scavenging of the charged species and the initial spatial distribution. The geminate charge recombination kinetics in cyclohexane is investigated and the relation with the charge scavenging is considered. The geminate ion kinetics in liquid CCl sub 4 is considered and the scavenging of excess electrons by CH sub 3 Br in cyclohexane, n-hexane and isooctane is treated in some detail. From the measurements of the microwave absorption the product of the yield and mobilities of the charged species is obtained. Provided the geminate kinetics is known it is possible to determine the mobility and the reactivity towards solutes of the charged species from measurements on a time scale on which the geminate recombination takes place. This is of importance when the charged species under investigation is short lived (e.g. because of reaction with impurities). In this way the mobility and reactivity of the negative species in liquid hexafluorobenzene could be studied. While C sub 6 F sub 6 efficiently captures electrons in the gas phase as well as in hydrocarbon liquids, in pure liquid C sub 6 F sub 6 efficient migration of the negative charge takes place. The study of the nature of this phenomenon is the subject of Part II. (Atomindex citation 13:671077)