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Hydrodynamic models of surface plasmons on clean metal surfaces are studied for various choices of additional boundary conditions and of equilibrium electron density profile. Both intrinsic and correctable defects of an approach based on hydrodynamics are illustrated. We conclude that for a clean metal surface, a hydrodynamic model of surface plasmons should only be used with considerable caution.
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Schwartz et al. (1982) studied this question.
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