Spectroscopic determination of the ac voltammetric response

Abstract It is shown that the spectroscopic response of a redox system to a sinusoidally modulated potential ramp mirrors the ac voltammetric response. This response, however, contains no contribution from the charging current and is specifically sensitive to individual species in the overall redox process. Thus homogeneous and heterogeneous kinetic behaviour of the individual species may be studied. Results are presented for the ferro-ferricyanide system.