Profile of the Refractive Index in the Cathodic Diffusion Layer of an Electrolyte Containing CuSO4 and H 2 SO 4

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Abstract
The profile of the refractive index in the cathodic diffusion layer of a solution containing and was measured by holographic interferometry. Measurement was carried out at various heights from the lower edge of the cathode and also at various cathodic current densities up to the limiting value. The theoretical expression for the difference of the refractive index between the cathode surface and the bulk electrolyte was derived assuming a uniform distribution of the local cathodic current density. Experimental results obtained at the current densities below one‐half of the limiting value were in good agreement with the theoretical value. Measurement was also conducted with the solutions containing and , respectively, at their cathodic limiting current densities. concentration at the cathode surface was estimated from the interferogram and concentration at the cathode surface was presumed to be virtually zero at the limiting current. The estimated concentration was compared with the theoretical values, and it was found that they are in good agreement with each other.

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