The (1×2)-Au(110) surface has been studied using He-beam scattering with time-of-flight detection. The experiments included measurement of the diffraction pattern and the specular intensity as a function of azimuthal angle of incidence; the latter curve is found to be highly structured. The data have been modeled using the local-density approximation to calculate the charge distribution in atoms, and treating the He-surface potential as a superposition of pseudopairwise terms. The diffraction pattern and azimuthal data can be well fitted using close-coupled channel calculations and varying only three parameters, giving confidence that the calculated electron density is accurate. It is found that the peak-to-peak corrugation of the 10-3 Å-3 isoelectron density surface is ≊1.2 Å, showing a substantial smoothing with respect to the corrugation of 1.55 Å found when superposing the calculated free atomic densities. In addition we have examined the sensitivity of the model calculations to geometric structure. They are consistent only with the expected missing row structure, and yield the separation between the first and second layers with an accuracy of 6%.

Electron density and structure of the (1×2)-Au(110) surface studied by He-beam scattering

MORGANTE, ALBERTO;TOMMASINI, FERNANDO
1993-01-01

Abstract

The (1×2)-Au(110) surface has been studied using He-beam scattering with time-of-flight detection. The experiments included measurement of the diffraction pattern and the specular intensity as a function of azimuthal angle of incidence; the latter curve is found to be highly structured. The data have been modeled using the local-density approximation to calculate the charge distribution in atoms, and treating the He-surface potential as a superposition of pseudopairwise terms. The diffraction pattern and azimuthal data can be well fitted using close-coupled channel calculations and varying only three parameters, giving confidence that the calculated electron density is accurate. It is found that the peak-to-peak corrugation of the 10-3 Å-3 isoelectron density surface is ≊1.2 Å, showing a substantial smoothing with respect to the corrugation of 1.55 Å found when superposing the calculated free atomic densities. In addition we have examined the sensitivity of the model calculations to geometric structure. They are consistent only with the expected missing row structure, and yield the separation between the first and second layers with an accuracy of 6%.
1993
http://prb.aps.org/pdf/PRB/v47/i11/p6705_1
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

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/11368/2556982
 Avviso

Registrazione in corso di verifica.
La registrazione di questo prodotto non è ancora stata validata in ArTS.

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 10
social impact