Solid state FDMR studies of ion-molecule reactions in radiolysis of saturated hydrocarbons

Abstract

Studies of radical cations produced in pulse radiolysis of frozen hydrocarbon solutions have been carried out using time-resolved fluorescence-detected magnetic resonance (FDMR). These first time-resolved solid-state FDMR experiments were performed with a spectrometer modified to allow sample translation and cooling to near liquid-helium temperature. The stability of solvent radical cations in decalins increases at lower temperatures in solid phase. The contrasting behavior of the cis- and transdecalin radical cations is indicative of the importance of ion-molecule reactions of alkane radical cations. Experiments of this type provide information about the dynamics of charge pair recombination in solids.