The dependence of the kinetic dynamics of the polystyrene dimer radical cation (Ph2+) on the CCl4 concentration was investigated in a cyclohexane solution by nanosecond pulse radiolysis. A slow formation of (Ph-2(+)) (k = 1.5 x 10(9) M-1 s(-1)) through electron transfer quenching of the polystyrene excimer was observed upon the addition of 10-100 mM CCl4. This electron transfer quenching led to an increase of the free ion yield (similar to 20%). (c) 2006 Elsevier B.V. All rights reserved.