Surface plasmon on Ag(110): observation of linear and positive Dispersion and azimuthal anisotropy

Measurements are reported of surface plasmon energy and dispersion carried out by electron energy loss spectroscopy on Ag (110) along both high-symmetry crystallographic directions. For small q(parallel-to) the data show a linear and positive dispersion with a strong azimuthal dependence that is twice as large along the [001] direction as along [110BAR]