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The high frequency collective dynamics of molten potassium has been investigated by inelastic x-ray scattering, disclosing an energy/momentum transfer region unreachable by previous neutron scattering experiments (INS). We find that a two-step relaxation scenario, similar to that found in other liquid metals, applies to liquid potassium. In particular, we show how the sound velocity determined by INS experiments, exceeding the hydrodynamic value by ≈ 30 region 1<Q<3 nm^-1, which marks thedoi:10.1063/1.1689641 pmid:15267728 fatcat:qmk2a3pcyfc6pbcwim2ul5wt5e