Phonon-like and single particle dynamics in liquid lithium

Details Phonon-like and single particle dynamics in liquid lithium Phonon-like and single particle dynamics in liquid lithium

1999-11-02

arxiv.org/abs/cond-mat/9911021v1

Europhysics Letters 50, 189 (2000).

Physics

Condensed Matter

Disordered Systems and Neural Networks

3 pages and 5 figures

Scientific paper

10.1209/epl/i2000-00253-5

The dynamic structure factor, S(Q,E), of liquid lithium (T=475 K) has been determined by inelastic x-ray scattering (IXS) in the momentum transfer region (Q = 1.4-110 nm-1). These data allow to observe how, in a simple liquid, a phonon-like collective mode evolves towards the single particle dynamics. As a function of Q, one finds: i) at low Q's, a sound mode with a positive dispersion of the sound velocity, ii) at intermediate Q's, excitations whose energy oscillates similarly to phonons in the crystal Brillouin zones, and iii) at high Q's, the S(Q,E) approaches a Gaussian shape, indicating that the single particle dynamics has been reached.

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