Abstract
The static dielectric function, ɛ(q, 0), of liquid lithium was calculated at four different temperatures, treating the liquid metal as a binary mixture of conduction electrons and ions. For the ions, a potential of interaction derived from the neutral pseudo atom (NPA) method and the variational modified hypernetted chain (VMHNC) theory of liquids were used. For the electrons, the response function which includes exchange and correlations obtained from the local field factor derived from the local density approximation (LDA) was used, in order to be consistent with the NPA method. the results show that, at the temperatures for which the calculations were carried out, the behaviour of ɛ(q) is dominated by the ionic contributions.
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