Abstract
The application of many body techniques to interfaces is restricted by the labour involved in obtaining a screened interaction which is valid in the interface region. To be realistic this must contain not only non-locality but also the extra poles in energy corresponding to interface excitations. An approximation is presented which obtains the interaction in terms of the bulk dielectric properties of the two media but still has the necessary properties mentioned above. The extra energy poles are examined and shown to correspond to surface plasmon type excitations at the interface. The asymptotic form of the exchange and correlation potential is calculated using the non-local screened interaction and shown to correspond to the classical image potential at large distances from a metal surface.
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