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Infrared Surface-Wave Interferometry On W(100), L. M. Hanssen, D. Mark Riffe, A. J. Sievers

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An IR grating on a clean W(100) surface is shown to generate both homogeneous and inhomogeneous surface electromagnetic waves. An observed interference between these two components, which can be described in terms of a two-beam interferometer with variable arm amplitude and fixed optical path, is used to measure the plasma frequency accurately in the IR.