Transverse collective modes in liquid binary alloys

Transverse current correlations in binary liquid alloys are investigated by molecular dynamics simulation. The study includes several Li-Mg, Li-Na and Li-Pb alloys. The characteristics of both shear and transverse optic-like modes are discussed. The former modes are associated with the number densit y fluctuations whereas the latter are related to the concentration fluctuat ions. Special attention is paid to the dependence of the results on the mas s ratio and composition of the alloy.