Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2002-01-04
Physics
Condensed Matter
Disordered Systems and Neural Networks
RevTex, 7 pages, 6 eps figures. Accepted by Phys. Rev. E
Scientific paper
10.1103/PhysRevE.65.031205
Inelastic X-ray scattering data have been collected for liquid sodium at T=390 K, i.e. slightly above the melting point. Owing to the very high instrumental resolution, pushed up to 1.5 meV, it has been possible to determine accurately the dynamic structure factor, $S(Q,\omega)$, in a wide wavevector range, $1.5 \div 15$ nm$^{-1}$, and to investigate on the dynamical processes underlying the collective dynamics. A detailed analysis of the lineshape of $S(Q,\omega)$, similarly to other liquid metals, reveals the co-existence of two different relaxation processes with slow and fast characteristic timescales respectively. The present data lead to the conclusion that: i) the picture of the relaxation mechanism based on a simple viscoelastic model fails; ii) although the comparison with other liquid metals reveals similar behavior, the data do not exhibit an exact scaling law as the principle of corresponding state would predict.
Balucani Umberto
Ruocco Giancarlo
Scopigno Tullio
Sette Francesco
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