On the optical constants of metals at wavelengths shorter that their critical wavelengths

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Abstract
The optical properties of Al, In, Mg, and Si have been investigated in the extreme ultraviolet at wavelengths shorter than their critical wavelengths. It was found that Al, Mg, and Si, which have loosely bound valence electrons and tightly bound core electrons can be described, to a good approximation, by the free electron theory. For In, in this spectral range, the dominant term in the complex dielectric constant is the free electron term, however, other absorption mechanisms are not negligible so a simple two-parameter thoery cannot be used

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