The partial molar volumes of hydrated proton and electron determined with time-resolved photoacoustic

Abstract
Photoinduced charge-transfer reactions in solution produce the formation or destruction of ionic species. Therefore, important structural rearrangements in the solutes and their solvent spheres can be expected, with a net (positive or negative) reaction volume change, V_R, which in turn represents the difference between the individual partial molar volume, V^o, of the products and reactants. The partial molar volume is an important thermodynamic magnitude used in solution chemistry. In this presentation, the V_R information obtained with time-resolved photoacoustics (TRP) for a couple of photoinduced charge-transfer processes was used to estimate the V^o of fundamental ionic species in aqueous solutions, such as the hydrated proton and electron.