Interplay between the ionic and electronic density profiles in liquid   metal surfaces
  First principles molecular dynamics simulations have been performed for the liquid-vapor interfaces of liquid Li, Mg, Al and Si. We analize the oscillatory ionic and valence electronic density profiles obtained, their wavelengths and the mechanisms behind their relative phase-shift. 
L.E. Gonzalez, D.J. Gonzalez and M.J. Stott