1999/11/02 by T. Scopigno, U. Balucani, Alessandro Cunsolo +6 · 3 citations
Engineering · Materials Science · Physics and Astronomy · #Material Dynamics and Properties #Theoretical and Computational Physics #Thermodynamic and Structural Properties of Metals and Alloys #cond-mat.dis-nn
paper · pdf · doi:10.1209/epl/i2000-00253-5
published as Europhysics Letters 50, 189 (2000). · 3 pages and 5 figures
arxiv created 1999/11/02 · openalex publication_date 2000/04/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
The dynamic structure factor, S ( Q , E ), of liquid lithium ( T = 475 K) has been remeasured by inelastic X-ray scattering (IXS) in an extended momentum transfer region ( Q = 1.4–110 nm −1 ) and with improved energy resolution (down to 1.5 meV). These new data on such prototypical simple liquid allow to observe the full evolution with Q from a phonon-like collective mode 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.