The application of ellipsometry and electrochemical techniques to the oxidation of gold reveals that a chemisorbed species is formed in the potential region 0.2–1.1V vs. SCE in acidic solution with gold oxide formed at more anodic potentials. In alkaline solution the chemisorbed species formed in the potential region −0.8 to +0.2V vs. SCE with oxide formation at more anodic potentials. Evidence supporting a change in the optical properties of the oxide film with p H and, for alkaline solution, with the presence of chloride ions, is presented.
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Sirohi et al. (1969) studied this question.