Surface plasmons on Pd(110): An ab initio calculation

The surface excitation spectra of the Pd(110) is analyzed in framework time-dependent density functional theory. ab initio electronic structure this included into evaluation response function using a linear approach. At small momentum transfer extrapolated energy plasmon close to electron-energy-loss-spectroscopy measurements and can be understood considering bulk Pd dielectric function. However, upon increase evaluated dispersion presents significant discrepancies with published experimental data. While initially strong negative slope, our calculations indicate weak positive at all finite transfers where collective observed. Interestingly, we do not observe any noticeable effect on excitations induced by large number states valence band Pd(110). These produce additional mode energies below plasmon.