| Abstract
| - The oscillatory reduction of hydrogen peroxide on an n-typegallium arsenide electrode was studied bymeans of the electrolyte electroreflectance technique. It is foundthat during the current oscillations boththe reflectivity and electroreflectance oscillate with qualitativelydifferent patterns. A simple model,which attributes the current oscillations to an anomalous dependence ofthe band bending in thesemiconductor depletion layer on the potential drop across thesemiconductor/electrolyte interface, isconsidered for comparison. It is concluded that the absolutereflectivity detects a slow variable of thesystem, most likely related to the chemical composition of the surface,and the electroreflectance detectsa fast variable of the system, most likely related to the interfacialpotential distribution.
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