Plasmon Observation Using X Rays

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Abstract
We have investigated the problem of plasmon observation using high-energy photons within the context of the random phase approximation. It is shown that the experimental results from a study of Be by Miliotis can be readily understood from this point of view. It is further shown that these results include both collective and single-particle effects and that the collective effects persist well beyond the "critical wave vector." We discuss the concept of a critical wave vector.