On the generation of the hydrated electron during the sonolysis of aqueous solutions

Abstract

The formation of the hydrated electron through the secondary reaction, H + OH- → H2O + eaq, has been examined in the sonolysis of argon-saturated aqueous solutions at an ultrasound frequency of 355 kHz. The detection of the hydrated electron was achieved by measuring its reaction with the one-electron acceptors Fe(CN)63- and methyl viologen. The results obtained indicate that hydrated electrons are produced predominately at the bubble/aqueous solution interface at comparatively high local concentrations, estimated to be â‰1.5 × 10-3 M. The half life of the hydrated electron under such conditions is estimated to be â‰60 ns. © 2013 American Chemical Society.