Format

Send to

Choose Destination
See comment in PubMed Commons below
J Chem Phys. 2004 May 1;120(17):8089-94.

Collective dynamics in molten potassium: an inelastic x-ray scattering study.

Author information

1
Dipartimento di Fisica and INFM, Universita di L'Aquila, I-67010, L'Aquila, Italy.

Abstract

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 inelastic neutron scattering (INS) experiments. 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 approximately 30%, is the higher limit of a speedup, located in the momentum region 1 < Q < 3 nm(-1), which marks the departure from the isothermal value. We point out how this phenomenology is the consequence of a microscopic relaxation process that, in turn, can be traced back to the presence of "instantaneous" disorder, rather than to the crossover from a liquid to solidlike response.

PMID:
15267728
DOI:
10.1063/1.1689641
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for American Institute of Physics
    Loading ...
    Support Center