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The formalism for the modification of the pair interaction energy between the atoms of a binary alloy due to the electron-ion interaction as modified by the electron–electron interaction, is developed to lowest order. In a manner analogous to the treatment of Krivoglaz it is shown how the fluctuation-dependent part of the alloy pair energy contains a contribution from [epsilon](q), the dielectric function for the alloy, which in turn reflects singularities at [epsilon](2kF), where kF is the Fermi wavevector. The strength of these singularities and their contribution to the diffuse scattering of radiation is discussed and recent experimental observations of several groups on `imaging' the Fermi surface in this manner are presented.

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