Pulse radiolysis is used to determine the absorption spectra of the transient species formed during the decay of the hydrated electron in an aqueous solution of Ag-1(I)(NH3)(2)(+). The absorption spectrum attributed to Ag-1(0)(NH3)(2) presents three peaks at 345, 385, and 435 nm, A theoretical estimation of the redox potential of the couple Ag-1(I)(NH3)(2)(+)/Ag-1(0)(NH3)(2) yields the value -2.4 V-NHE. This value is consistent with the fact that Ag-1(I)(NH3)(2)(+) is not directly reduced by (CH3)(2)CoverdotO(-) and shows that the redox potential of the silver monomer couple is lowered by ammonia ligands.