Temperature dependence of the rate constant for the reaction e–aq+ OH in water up to 150 °C

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Abstract
The temperature dependence of the rate constant for the reaction, e– aq+ OH → OH–(1) has been measured in liquid water up to 150 °C. The values of k1 were derived from fitting the absorbance vs. time plots of the decay of the hydrated electron in pulsed-irradiated deoxygenated 1× 10–3 mol dm–3 sodium borate solutions using the computer programme FACSIMILE. The values for k1 were (2.8 ± 0.2)× 1010(18 °C), (5.0 ± 0.4)× 1010(75 °C), (6.0 ± 0.5)× 1010(100 °C) and (7.2 ± 0.3)× 1010 dm3 mol–1 s–1(150 °C). The temperature dependence of k1 was found to be much less than for diffusion in water. The temperature dependence of εmax for the hydrated electron has been determined up to 200 °C.

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