Temperature impact on the primary radiolysis yields concerning the hydrous electron

We have studied the impact of temperature on the water radiolysis formation rate of the hydrous electron in presence of selenate di-anion SeO42+. We have used a high temperature (up to 500 Celsius degrees) optical cell coupled to the electron accelerator Alienor. It appears that the capture of the hydrous electron by selenate follows an Arrhenius law till the sub-critical range, beyond this range the kinetics of the reaction seems more erratic. We have also studied the capture of the hydrous electron by methyl-viologen (MV2+) at 20 and 380 Celsius degrees. It seems that at high temperature more hydrous electrons are produced, it might be interpreted as a consequence of the shift toward the right of the following equilibrium reaction: OH- + H. ↔ e-(aq) + H2O. All these results need to be confirmed. (A.C.)