We present high resolution inelastic x-ray scattering measurements of the coherent dynamic structure factor S(Q,ω) of liquid lithium at momentum transfers 0.36≤Q≤5^-1. The determined S(Q,ω) agrees much better with molecular dynamic simulations using the neutral pseudo-atom potential rather than the empty core potential. We observe a positive dispersion in the sound velocity confirming that in liquid lithium the longitudinal dynamics reaches a solid-like response at high frequencies.
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Sinn et al. (1997) studied this question.
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