Structural study of Rb and Cl coadsorption on Cu(111): a case of overlayer compound formation

A structural study of the adsorption of Rb on a Cu(111)(root 3multroot 3)R30 deg -Cl surface has been conducted using normal-incidence x-ray standing-wavefield absorption at both the chlorine and rubidium surface atoms. The results indicate reaction of the coadsorbates to form an overlayer of approx...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 1997-06, Vol.9 (22), p.4593-4602
Main Authors: Lüdecke, J, Skordas, S, Jackson, G J, Woodruff, D P, Jones, R G, Cowie, B C C, Ithnin, R, Papageorgopoulos, C A
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Metals. Metallurgy
Physics
Solid surfaces and solid-solid interfaces
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:A structural study of the adsorption of Rb on a Cu(111)(root 3multroot 3)R30 deg -Cl surface has been conducted using normal-incidence x-ray standing-wavefield absorption at both the chlorine and rubidium surface atoms. The results indicate reaction of the coadsorbates to form an overlayer of approximately 1.2 ML of RbCl(100), which is essentially incommensurate with the substrate. The RbCl-Cu outermost layer spacing is similar to that seen for pure Rb adsorption on Cu(111). This RbCl layer is spread over the surface and not agglomerated into thicker islands. The results are consistent with prior characterization of the system by Auger electron spectroscopy and temperature-programmed desorption, and with STM studies of NaCl deposition on Al(111).
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/9/22/011