Metal Adatom Induced Corrugation of Cu(001)
نویسندگان
چکیده
We report the discovery of a metal adatom induced corrugation of Cu(001) as probed by atom beam scattering (ABS). At Pb or Bi coverages of 0.05 (fraction of Cu layer), and while a (1×1) LEED pattern is still observed, the ABS diffraction pattern from uncovered Cu(001) areas has changed considerably from that of clean Cu(001). We show that these uncovered areas have become up to ten times more corrugated than the clean Cu(001). We performed several carefully designed experiments to test whether our data could be interpreted as a result of scattering from adsorbate islands or from a lattice of randomly occupied sites. Instead, we ascribe the nature of this metal adatom induced corrugation to the redistribution of the Cu(001) surface charge density due to the adsorption of Pb or Bi atoms. No effect is seen following adsorption of weakly chemisorbed adatoms, such as Hg. A model consistent with all our observations is presented.
منابع مشابه
Cu adatom charging on Mo supported ScN, MgO and NaF
Molybdenum supported thin films of ScN, MgO and NaF with a Cu adatom have been studied in the framework of density functional theory. We have observed a charge transfer from the metal/film interface to the Cu atom and investigated its relation to surface and interface deformations. We find that a weak interaction between the metal and the film is a promising prerequisite for adatom charging. Th...
متن کاملEffects of short-range attraction in unstable metal (110) epitaxial growth: Molecular dynamics simulations for Cu, Ag, and Al
The results of molecular dynamics simulations of the process of adatom deposition near steps for Cu 110 , Ag 110 , and Al 110 surfaces are presented in order to determine the effects of short-range SR attraction on the surface current and selected mound angle during unstable epitaxial growth. Our results indicate that, in qualitative agreement with previous work on metal 100 and 111 surfaces, f...
متن کاملTime-Dependent Capture Numbers with Repulsive Pair Interactions: Cu/Cu(111) and Ge/Si(001)
Recent experiments and calculations have shown that weak repulsive interactions between adsorbate atoms may shift nucleation kinetics from the well-known diffusion limit towards the attachment-limited case. The distinctions between diffusionand attachment-limited kinetics are clarified, and the increased importance of the transient nucleation regime in the latter case is shown to be due to a co...
متن کاملThe interface structure of n-alkylthiolate self-assembled monolayers on coinage metal surfaces.
The current state of understanding of the structure of the metal/thiolate interface of n-alkylthiolate 'self-assembled monolayers' (SAMs) on Cu(111), Ag(111) and Au(111) is reviewed. On Cu(111) and Ag(111) there is now clear evidence that adsorbate-induced reconstruction of the outermost metal layer occurs to a less atomically-dense structure, with the S head-group atom bonded to four-fold and ...
متن کاملLocalization of the Cu111 surface state by single Cu adatoms.
The Cu adatom-induced localization of the two-dimensional Shockley surface state at the Cu(111) surface was identified from experimental and simulated scanning tunneling microscopy spectra. The localization gives rise to a resonance located just below the surface state band edge. The adatom-induced surface state localization is discussed in terms of the existence theorem for bound states in any...
متن کامل