Abstract

Ellipsometric measurements on the adsorption system xenon on graphite [5] have been confronted with partly Drude's macroscopic theory, partly Sivukhin's microscopic theory. The optical constants necessary for the theory have been calculated for each monolayer, using two experimentally known quantities, the polarizability of a free xenon atom, and the nearest-neighbour distance Xe-Xe. The ellipsometric signals calculated for each of the five monolayers are in excellent agreement with experiment, the macroscopic theory giving the best quantitative agreement. For the first incomplete monolayer the results do not grant a statement in favour of one theory or the other.

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