Measurement of Surface Plasmon Dispersion in Aluminum and Indium

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Abstract
Energy-loss experiments with 50-keV electrons on thin polycrystalline films of Al and In yielded data for the surface plasmon dispersion up to k∥=0.47 and 0.42 Å−1, respectively. The wave-vector dependence of the surface plasmon frequency of Al shows a significant increase for k∥>0.3 Å−1, while in the case of In there is only a weak increase for k∥>0.2 Å−1.