TRANSIENT ABSORPTION-SPECTROSCOPY OF HIGH-MOBILITY IONS IN DECALIN

Transient absorption spectroscopy is used to demonstrate that pulse ra diolysis of a decalin mixture (63% cis-decalin + 37% trans-decalin) wi th 15 MeV electrons results in formation of high-mobility solvent hole s. 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 th e experiment, the lifetime of the rapidly migrating solvent holes is s imilar to 150 ns, which identifies them as the high-mobility cations o bserved by dc and microwave conductivity.