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Abstract

A light transmissible working electrode, an auxiliary electrode and a reference electrode are provided in an electrolytic cell having a light transmissive window. The working electrode comprises, for instance, a thin film vapor deposited on inner surface of the light transmissive window. A sample solution containing components which cause photochemical reaction is introduced into the electrolytic cell. A step-functional light emitted from a monochromatic light source is irradiated into the electrolytic cell through the light transmissive window. When light is irradiated to the light transmitting window, the light passes through the working electrode to give an energy to the sample solution to bring about photochemical reaction. Concentrations of the components in the sample solution can be obtained from the difference between amplitude of current passing when the light is irradiated to the sample solution and amplitude when no light is irradiated. Furthermore, it also becomes possible to analyze mechanism of the photochemical reaction from the detected changes of current intensity by observing transitional phenomena of the reaction.

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