Abstract
The formation of the anodic oxide film on Pt has been investigated at wavelengths in the visible using voltage scanning ellipsometry. Changes in light intensity in an ellipsometric experiment have been used to determine the changes in Δ 0, ψ 0, and reflectivity of the surface. From these three parameters, the effective complex refractive index and thickness of the surface film have been calculated, using a three-layer model. The oxide film on Pt has been found to have different optical properties above and below 1.1 V versus NHE. The apparent film thickness increases with constant optical properties between 1.1 and 1.6 V, indicating that the oxide may form in patches on the surface. The optical constants of this film show small dependence on wavelength in the visible. The anodic oxide film on Au has also been studied using this technique. The presence of the optical absorption edge of Au in the visible region of the spectrum causes the Au surface to be very sensitive to interactions with the surface oxide. This results in a failure of the simple three-layer model at wavelengths near the absorption edge of Au.
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