Pulse-radiolysis study on the yield of hydrated electron at elevated temperatures

A pulse-radiolysis technique has been used to estimate G(e_aq^-) at elevated temperatures up to 250°C. Observation in pure water indicated that absorbance at λ_max of e_aq^- increases significantly with temperature, by 1.4 times in going from 20 to 250°C, when compared at supposedly equivalent times by which most of spur decay probably finishes at each temperature. This temperature dependence was considered to arise primarily from variation in G(e_aq^-) itself. In another series of experiments Cd²⁺ was used as an e_aq^- scavenger. The estimated G(Cd⁺) in a dilute Cd²⁺ solution was 3.5 and 3.8 respectively at 200 and 250°C in accord with the above estimation on the temperature dependence of G(e_aq^-).