Hydrated electron in subcritical and supercritical water: a pulse radiolysis study

Temperature dependences of the eaq− spectrum and Gεmax were investigated by the pulse radiolysis method over a temperature range of 25–400°C including the supercritical condition and the eaq− formation in supercritical water (D2O) was confirmed. With increasing temperature, the absorption peak (λmax) of eaq− shifts significantly to longer wavelength. The value of Gεmax in supercritical water is considerably smaller than in liquid water at room temperature. The behavior of eaq− revealed here is helpful for an extensive understanding of water radiolysis and for the study of eaq− involving radical reactions in supercritical water.