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Light Scattering from Methanol Adsorbed onto Si/SiO2-Surfaces

In a previous ellipsometric study we found that methanol is adsorbed onto silicon surfaces covered by a thin silicon oxide film in the form of methanol clusters. However, this conclusion was in part based on theoretical interpretation of measured data and it was therefore of interest to get an independent confirmation of the clustering effect. We have now carried out measurements of the light scattered from the sample surface during the adsorption process. The level of light scattering shows a monotonic increase with coverage thus confirming the conclusions drawn from the ellipsometric measurements. Furthermore, angular variation of light scattering gives us information about the distribution of clusters.