Activation energy of the hydrated electron + water reaction and the ultra-violet absorption spectrum of the hydrated electron
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 63, 2975-2982
- https://doi.org/10.1039/tf9676302975
Abstract
The ultra-violet absorption spectrum of the hydrated electron has been accurately determined down to 2200 Å where the molar extinction coefficient is 475 M–1 cm–1. A weak absorption with a lifetime of a few microseconds was noted below 3000 Å. This absorption was not due to either the OH, HO2 or H2O2 species produced by the irradiation. The activation energy of the reaction e– aq+H2O→H+OH– has been determined, by rate measurements over the temperature range 5–81°C, as 6.7±0.7 kcal/mole. Combined with other thermodynamic data this value indicates that the reaction has a large negative entropy ΔS≠ of activation of –22 cal/mole deg.Keywords
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