Abstract
The refractive index change, Δn, i.e., the concentration of the solution at a vertical cathode was studied by a Lloyd mirror laser interferometer during the electrodeposition of copper from solutions with and without ten‐fold excess of . The initial galvanostatic transients were studied below the limiting current density and above to the start of H2 bubble formation. It was found that the concentration decreased linearly with it1/2 for both solutions. The effect of an assumed linear refractive index gradient on the measured value of Δn is discussed in addition to the influence of the supporting electrolyte.
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