The reaction between hydrated electrons (e(aq)(-)) is postulated to occur via proton transfer when electrons occupy neighbouring cavities in HB network. Subsequent recombination of a spatially correlated pair (H-center dot, e(aq)(-)) leading to the formation of H-2 is specific to backward scattering in rigid HB network stiffen by the presence of supramolecular structures of continuously connected four-bonded molecules. Disappearance of backward scattering between 150 and 200 degrees C favours dissociation of (H-center dot, e(aq)(-)). The postulated mechanism explains slower decay of e(aq)(-) in alkaline hydrogenated solutions above 150 degrees C. (C) 2015 Elsevier B.V. All rights reserved.