It is established by ellipsometric measurements that the interaction process of a sheared surface of single-crystal cadmium telluride with atmospheric air has two stages. In the first 7-10 days, the character of the change of the measured ellipsometric parameters corresponds to the formation of an absorbing layer with a thickness of one or two monatomic layers. Beginning at 20 days, a transparent film appears, possibly an oxide, whose refractive index is close to 2.2, while the thickness increases to 5-6 nm in an oxidation time of up to 1 year. Starting from literature data, it is assumed that the inner film is a layer of free tellurium, while the outer film is formed by cadmium or tellurium oxides or a mixture of them.
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