Collective dynamics in molten potassium: an Inelastic X-ray Scattering study

Details Collective dynamics in molten potassium: an Inelastic X-ray Scattering study Collective dynamics in molten potassium: an Inelastic X-ray Scattering study

2004-01-14

arxiv.org/abs/cond-mat/0401244v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 5 .eps figures. To appear in J. Chem. Phys

Scientific paper

10.1063/1.1689641

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 $\approx 30 %$, is the higher limit of a speed up, located in the momentum region $1

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