The Photogalvanic Effect II. The Photogalvanic Properties of the Thionine-Iron System

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Abstract
The oxidation‐reduction system thionine‐iron, described in paper I, provides an extremely sensitive photogalvanic cell. The illuminated half‐cell is negative in respect to the nonilluminated one. The photogalvanic potential ε* is determined in relation to composition and light intensity. The results are in a qualitative (and partially quantitative) agreement with the kinetic theory of the photogalvanic effect. In strongly bleached solutions, the electrode potential is maintained by semithionine ions transferring electrons to the electrode, and ferric ions acquiring electrons from the electrode, whereas ferrous ions and leukothionine ions remain practically inactive. In weakly bleached solutions, the mechanism is more complicated.

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