Bidimensional spectroelectrochemistry

A new methodology is presented to offer the possibility of simultaneously o btaining two different spectroscopic signals in a single spectroelectrochem ical experiment. Taking the plane of the electrode surface as a spatial ref erence, normal-beam and parallel-beam W-vis absorbance signals are jointly analyzed, revealing important experimental differences between the two kind s of signals. Two different chemical systems are selected to show the possi bilities of the bidimensional spectroelectrochemistry: a simple diffusive p rocess and an adsorptive electrode reaction. Comparative results show clear ly that the two kinds of spectroscopic signals, both normal and parallel to the electrode surface, have to be used together in the study of any electr ode reaction scheme.