POSITIVE-CHARGE TRANSFER IN IRRADIATED SEC-BUTYL CHLORIDE GLASSY SOLUTIONS AT 77-K AS STUDIED BY THE PULSE-RADIOLYSIS METHOD

The time evolution of optical absorptions of cationic species in sec-butyl chloride glasses at 77 K was observed over the range of 10-5 to 1 s after irradiation with electron pulses. A band tail newly found at wavelengths shorter than 420 nm in a pure glass is assignable to a precursor of the trapped hole characterized by the 480-nm band. In the presence of an aromatic solute, trapped holes decay over the above time range and solute cations grow concurrently. In biphenyl-pyrene solutions, the decay of biphenyl cations is accompanied by the growth of pyrene cations. The observed positive-charge transfer is consistent with long-range electron transfer. © 1979 American Chemical Society.