Me. Bachlechner et al., MULTIPAIR EXCITATIONS IN AN ELECTRON LIQUID, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 115(1-4), 1996, pp. 23-26
Single (particle-hole)-pair excitations, as described in the well-know
n Lindhard function, are restricted to a strip in the (q, omega) plane
- the so-called particle-hole continuum. We present a perturbational
analysis of the dynamic dielectric function allowing a generalization
of this property for n-pair contributions. Consequences for the electr
on energy-loss function and related quantities are discussed.