Transient absorption spectroscopy is used to demonstrate that pulse radiolysis of a decalin mixture (63% cis-decalin + 37% trans-decalin) with 15 MeV electrons results in formation of high-mobility solvent holes. These radical cations react with perylene with a rate constant of 8.5 x 10(10) mol(-1) dm(3) s(-1). This scavenging is faster by an order of magnitude than ion-molecule reactions of normally diffusing ions (similar to(5-7.5) x 10(9) mol(-1) dm(3) s(-1)). Under conditions of the experiment, the lifetime of the rapidly migrating solvent holes is similar to 150 ns, which identifies them as the high-mobility cations observed by dc and microwave conductivity.