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We use an explicitly isochoric two-temperature theory where the iontemperature is not assumed to be equal to the electron temperature, to analyzerecent X-ray laser scattering data for Aluminum in the ultra-fast-matter (UFM)regime up to 6 eV, obtained at the Standford Linac Coherent Light Source(LCLS). The observed surprisingly low conductivities are explained by includingstrong electron-ion scattering effects using the phase shifts calculated viathe density-functional neutral-pseudo-atom model (NPA). The applicability ofthe Mermin model to UFM is questioned. The static and dynamic conductivity,complex collision frequency and the plasmon line-shape are evaluated within aBorn approximation and without the use of the Mermin response. This approach,where all needed quantities are obtained from the NPA model, provides goodagreement with the reported experimental results.

physical review. e

The dynamic conductivity and the plasmon profile of Aluminum in the  ultra-fast-matter regime; an analysis of recent X-ray scattering data from  the LCLS