Abstract

Surface nonradiative dipolar plasmons are shown to be collective excitations of the polarization charge density in a polar liquid. The dispersion relations of the tangential and normal modes are obtained for a polar liquid layer of finite thickness using the classical complex dielectric constant of Lobo et al. In contrast with the bulk dipolar plasmon the surface dipolar plasmons are highly dispersive in the long wavelength limit when retardation effects are taken into account. Such surface modes can be excited by resonance using the method of attenuated surface reflection. This method should, therefore, provide an experimental means of differentiating between the collective mode and the single-particle libration mode.

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