An exemplary output of the solver is shown in Figure (d) for a comprehensive reaction set describing the evolvement and equilibration of relevant constituents in an irradiated aqueous HAuCl4 solution. It consists of 42 chemical species distributed over 184 reactions (see the supporting information for details, including an enlarged and annotated version of the plot depicted in Figure (d) (Figure )). Figure depicts the set based on graph theory, revealing that the simulated steady-state concentrations of the species do not necessarily coincide with their importance within the reaction set (c.f. Figure ). A tabular representation and further information can be found in the supporting information (Table , and S1 Radiolysis). Cl -and Au appear to be the main products at low electron flux densities. HCl dominates the chlorine distribution at high electron flux densities, despite its strong dissociation behavior.