Photoinjection of electrons from metal electrodes by means of a laser pulse can be used to interrogate the reduction of radicals in aprotic solvents such as DMF, DMSO, and acetonitrile. Since the generating substrates must be more difficult to reduce than the resulting radicals, the method appears as complementary to the direct electrochemical method. The procedure that allows the extraction of the radical current-potential curve from the transient coulostatic photopotential is illustrated with the reduction of several arylmethyl radicals. The reduction potentials thus obtained are compared with previous determinations by other methods.