Yield and decay of the hydrated electron in proton tracks. A pulse radiolysis study

Abstract

Direct observation of the time dependence of the yield of e^–_aq produced in water by nanosecond pulses of 3 MeV protons is reported for the first time. From the effect of added hydroxide ion, G(e^–_aq) is estimated to be at least 3.6 at 10^–11 s, falling to 2.3 at 10^–9 s. The experimental measurements do not agree with predictions of the present diffusion model; modifications to improve the model are discussed.