Pulse-Radiolysis Studies of the Formation of Triplet Excited States in Cyclohexane Solutions of Naphthalene and Anthracene

Abstract

The radiolysis of solutions of napthalene and anthracene in cyclohexane and benzene has been studied using 3‐ to 11‐nsec pulses of 3‐MeV electrons. The triplet states of the solutes were observed via their characteristic absorption spectra, while the excited singlet states were observed via their fluorescence. The rate of formation of most of the triplet state was less than one nanosecond; a small portion, however, did grow in with a half‐life of 100 nsec. The possible mechanisms of production of the triplet state are discussed, and it is concluded that they are formed either directly from subexcitation electrons or from ion recombination.