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.