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Collective excitations in an early molten transition metal

We report inelastic x-ray scattering measurements of the atomic collective excitations of an early transition metal, namely liquid titanium at T=2020 K. The data show well-defined sound excitations with a low damping constant comparable to the damping observed in liquid alkali metals. Calculations of the spectrum of density fluctuations as a function of the excitation wave number based on a self-consistent mode-coupling approach were carried out. The calculations use only the number density and measured structure factors for the titanium and have no adjustable parameters. A remarkable agreement between the prediction of mode-coupling theory and experimental results was observed.