Inelastic X-Ray Scattering on Lithium for k > =2k sub F

X-ray inelastic scattering experiments on Li for wave vectors k > =2k sub F, where k sub F is the Fermi wave vector, that the plasmon excitation in Li continues all the way through the particle hole continuum, and that a second, unexpected peak appears for k > 2k sub F. For large k the random phase approximation (RPA) is inadequate. 9 ref.--R.B.