Abstract
Inelastic helium atom scattering has been used to investigate Ag(001) surface phonon modes and the influence of an adsorbed chlorine monolayer. For the Ag(001) surface we observe the preferential interaction of the He beam with shear-vertically (SV) polarized surface phonons. The scattered intensity per steradian from the Ag(001)c(2×2)Cl surface is reduced approximately two orders of magnitude compared to that for the clean surface. Our results for the chlorinated surface indicate that a SV polarized surface mode does not appear significantly below the lower bulk band edge in contrast to oxygen adsorbed on Ni(001). Although we did not observe high energy surface vibrations, based on these experiments and recent theoretical developments, we indicate conditions which would improve the observability of high energy surface vibrations by means of inelastic He scattering.
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Schedule a callMore From: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
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