Abstract
The ordered overlayer structures formed following the adsorption of Sb on Ag(111) have been studied using coaxial impact collision ion scattering spectroscopy (CAICISS). At coverages up to several atomic layers there is evidence for layer-by-layer growth at room temperature, although the individual layers show no long-range order. Subsequent annealing gives rise to two ordered phases, a (√3 × √3)R30°Sb and a (2√3 × 2√3)R30°Sb. Neon ion CAICISS data have been used to distinguish between overlayer and substitutional structural models for the (√3 × √3)R30°Sb phase, and pure substitutional and mixed substitutional/overlayer models for the (2√3 × 2√3)R30°Sb phase. Despite the complexity of multiple scattering contributions, these data clearly favour the substitutional adsorption site for the (√3 × √3)R30°Sb phase giving a surface alloy of the form Ag 2Sb. For the (2√3 × 2√3)R30°Sb phase, the data are best described by a model involving an ordered p(2 × 2)-Sb overlayer (periodicity relative to the substrate) superimposed on the (√3 × √3)R30°Sb surface alloy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.