Abstract
An investigation on the density dependence of the dynamic structure factor, S( Q, ω), for liquid rubidium was performed by inelastic neutron scattering experiments for a variety of conditions along the vapor pressure curve. Down to densities of about three times the critical density we found that the dynamics are still controlled by the metallic properties of the system. At higher temperatures and pressures and corresponding lower densities a deviation from these properties is found: at about twice the critical density S( Q, ω) is affected by molecular excitations. The effects of the excitations continue to even higher temperatures and lower densities. The interpretation of molecular excitations is qualitatively in accord with a simple model in which the total energy of Rb-lattices at 0 K is calculated from first principles. The agreement between theoretical and experimental results provides evidence for the appearance of molecules or clusters in expanded liquid alkali metals.
Published Version
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