Date of Original Version
We have carried out a back reflection x-ray standing-wave investigation to study the adsorbate-substrate bond length and bonding site for the system Rb/Cu(111). Our low-energy electron diffraction study showed an ordered (2×2) phase for one monolayer of Rb on Cu(111) (θ=0.25). By measuring both the (111) and (111¯) Bragg reflections at this coverage, we determine the Rb adsorption to be in the top site. We observe a high degree of order in the Rb overlayer perpendicular to the surface, with large disorder parallel to the surface.
Shi, X., Su, C., Heskett, D., Berman, L., Kao, C. C., & Bedzyk, M. J. (1994). Adsorption-site investigation of Rb/Cu(111) using the x-ray standing-wave method. Physical Review B, 49(20), 14638-14642. doi: 10.1103/PhysRevB.49.14638
Available at: http://dx.doi.org/10.1103/PhysRevB.49.14638