Effect of thermal vibration and the solid-liquid phase transition on electron dynamics: An inelastic x-ray-scattering study on Al

[摘要] Inelastic-x-ray-scattering measurements of the dynamic structure factor, S(q,omega), of electrons in Al both in the solid phase at rising temperatures and in the liquid are presented. The double-peak structure of S(q,omega) for q>q(c) (q(c)=plasmon cutoff vector), diminishes gradually with decreasing strength of the ion-core potential; the peak position and the sloping plateau of the S(q,omega) spectra for q>q(c) do not exhibit marked changes upon melting. The plasmon energy for q

[关键词] SELF-ENERGY CONTRIBUTIONS;LI METAL;DIELECTRIC FUNCTION;PLASMON DISPERSION;BAND-STRUCTURE;ALUMINUM;SYSTEMS;GAS;BERYLLIUM