Dielectric formulation of strongly coupled electron liquid at metallic densities. III. Dynamic structure factor

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Abstract
Dynamic structure factor of strongly coupled electron liquid at metallic densities is calculated theoretically on the basis of the general dielectric formulation and the numerical evaluation of the static structure factor presented in previous papers. The results are compared with the experimental data for Al and other metals on a number of specific points such as the plasmon dispersion curve both below and above the critical wave number, the plasmon linewidth, and asymmetry of the excitation spectrum. Overall features of the calculated excitation spectrum show substantially improved agreement with the experimental indications, with a notable exception that the theory does not account for the double-peak structure observed in some experiments. A theoretical expression for the plasmon dispersion coefficient is presented, which encompasses many of the existing formulas as its limiting cases; comparison with the experimental values is also given.