Surface plasmon dispersion on Pd[110] was investigated along the high-symmetry directions [1(1)over bar $>0] and [001] with angle-resolved electron-energy-loss spectroscopy. A large negative initial dispersion with transferred momentum is found in spite of the strong shift of plasmon and surface plasmon frequencies induced by the presence of the d bands. Their unfilled character in transition metals is thus demonstrated to affect the dispersion of the surface plasmon in a very different way than for noble metals, where the filled d bands are responsible for the positive initial dispersion.
The influence of d electrons on surface plasmon dispersion: Pd(110)
ROCCA, MARIO AGOSTINO;
1995-01-01
Abstract
Surface plasmon dispersion on Pd[110] was investigated along the high-symmetry directions [1(1)over bar $>0] and [001] with angle-resolved electron-energy-loss spectroscopy. A large negative initial dispersion with transferred momentum is found in spite of the strong shift of plasmon and surface plasmon frequencies induced by the presence of the d bands. Their unfilled character in transition metals is thus demonstrated to affect the dispersion of the surface plasmon in a very different way than for noble metals, where the filled d bands are responsible for the positive initial dispersion.
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