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We investigate the radiolysis of liquid water confined in a porous silicamatrix by means of an event-by-event Monte Carlo simulation of electronpenetration in this composite system. We focus on the physical andphysicochemical effects that take place in the picosecond range, before theradicals start to diffuse and react. We determine the radiolytic yields of theprimary species for a system made of cylindrical pores filled with water over awide range of pore radii $R_{\rm C}$. We show that the relative position of theconduction band edge $V_0$ in both materials plays a major role in theradiolysis of composite systems. Due to its lower $V_0$ as compared to that ofsilica, water acts as a collector of low-energy electrons, which leads to ahuge enhancement of the solvated electron yields for $R_{\rm C} \leq$ 100 nm.The confinement has also a marked effect on the spatial distribution of theradicals, which become isolated in a very large number of pores as $R_{\rm C}$decreases.

Radiolysis of water confined in porous silica: A simulation study of the physicochemical yields