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A point lattice model, with parameters adjusted to fit ab initio band-structure calculations for a sodium monolayer, is used to determine the longitudinal response to an external potential as a function of frequency and wavevector. The imaginary part of the response shows loss peaks associated with both inter-band and collective excitations. An energy-loss peak observed for a sodium monolayer on an aluminium substrate is explained qualitatively by the results of this calculation.
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Fuchs et al. (1989) studied this question.
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