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., Davies, H., Jardine, A., 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) [10.1103/PhysRevB.80.125426].

Surface dynamics and friction of K/Cu(001) characterized by helium-3 spin-echo and density functional theory

BRIVIO, GIANPAOLO
2009

Abstract

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
Articolo in rivista - Articolo scientifico
Surface; diffusion; alkali; helium scattering
English
Hedgeland, H., Kole, P., Davies, H., Jardine, A., 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) [10.1103/PhysRevB.80.125426].
Hedgeland, H; Kole, P; Davies, H; Jardine, A; Alexandrowicz, G; Allison, W; Ellis, J; Fratesi, G; Brivio, G
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/8611
Citazioni
  • Scopus 17
  • ???jsp.display-item.citation.isi??? 17
Social impact