Review

Non-hydrodynamic collective modes in liquid metals and alloys

¹ Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, 1 Svientsitskii Street, UA-79011 Lviv, Ukraine
² Institute of Applied Mathematics and Fundamental Sciences, National Polytechnic University of Lviv, UA-79013 Lviv, Ukraine

^a e-mail: bryk@icmp.lviv.ua

Received: 1 December 2010
Revised: 13 April 2011
Published online: 30 May 2011

Abstract

A short review of analytical and numerical results, obtained for collective dynamics in liquid metals and alloys within a theoretical approach of Generalized Collective Modes (GCM) is presented. The GCM approach permits to represent dynamic structure factors in wide ranges of wave numbers and frequencies as a sum of contributions from hydrodynamic and non-hydrodynamic processes. The origin of collective modes that make important contributions to dynamic structure factors beyond the hydrodynamic regime in liquid metals and alloys is discussed.