Helium-3 spin-echo measurements of K/Cu(001) are presented, the diffusional surface dynamics of the system at low coverages and on picosecond time scales. Langevin molecular-dynamics simulations are used, together with a potential-energy surface derived from density functional theory calculations, to provide further understanding of the experimental data. An anisotropic potential with a corrugation of 35-64 meV and a friction parameter of 1/4.5 ps-1 are found to give a good fit to the data for the lower coverages with the adsorbate interactions modeled with a dipole-dipole repulsion. Additionally, at the highest coverage, θ=0.084, a component of motion is observed perpendicular to the surface, analogous to that recently found for Na/Cu(001). © 2009 The American Physical Society
Hedgeland, H., Kole, P.R., Davies, H.R., Jardine, A.P., Alexandrowicz, G., Allison, W., et al. (2009). Surface dynamics and friction of K/Cu(001) characterized by helium-3 spin-echo and density functional theory. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 80(12).
Citazione: | Hedgeland, H., Kole, P.R., Davies, H.R., Jardine, A.P., Alexandrowicz, G., Allison, W., et al. (2009). Surface dynamics and friction of K/Cu(001) characterized by helium-3 spin-echo and density functional theory. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 80(12). |
Tipo: | Articolo in rivista - Articolo scientifico |
Carattere della pubblicazione: | Scientifica |
Presenza di un coautore afferente ad Istituzioni straniere: | Si |
Titolo: | Surface dynamics and friction of K/Cu(001) characterized by helium-3 spin-echo and density functional theory |
Autori: | Hedgeland, H; Kole, PR; Davies, HR; Jardine, AP; Alexandrowicz, G; Allison, W; Ellis, J; Fratesi, G; Brivio, G |
Autori: | |
Data di pubblicazione: | 2009 |
Lingua: | English |
Rivista: | PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevB.80.125426 |
Appare nelle tipologie: | 01 - Articolo su rivista |