Experimental observations of dispersing plasmons
1. q=0 energy of the plasmon by EELS
2. plasmon dispersion by EELS
3. shift of the plasmon energy and dispersion under
high pressure (increased electron density) by IXS
Electron energy loss spectroscopy (EELS)
Plasmon dispersion and electron-hole continuum
sodium
mass density 0.968 gcm-3
molar density 22.99 gmol-1
rs
=4.0 kF
=0.91 Å-1
EF
=3.1 eV
Inelastic X-ray scattering (IXS)