Site occupation of CO adsorbed on Ni(100) at high CO pressures

• Published in: Surface science Vol. 330; no. 1; pp. L646 - L650
• Main Authors: Grossmann, A, Erley, W, Ibach, H
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.06.1995; Amsterdam Elsevier Science; New York, NY
• Subjects: Adatoms; Applied sciences; Auger electron spectroscopy; Carbon monoxide; Chemisorption; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Infrared absorption spectroscopy; Ion etching; Low index single crystal surfaces; Metals. Metallurgy; Nickel; Physics; Solid surfaces and solid-solid interfaces; Surface structure and topography; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thermal desorption spectroscopy; Vibrations of adsorbed molecules; Chemisorption; Ion etching; Vibrations of adsorbed molecules; Low index single crystal surfaces; Thermal desorption spectroscopy; Adatoms; Auger electron spectroscopy; Nickel; Carbon monoxide; Infrared absorption spectroscopy; Reflection spectrum; Transition elements; Adsorption structure; Crystal faces; Infrared spectra; Absorption spectra; Coverage rate; Experimental study; Lattice gas; Surface structure
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(95)00428-9

The adsorption of CO on Ni(100) has been investigated by infrared reflection-absorption spectroscopy in the temperature range of 85 to 300 K. At 300 K we achieved CO coverages up to 0.8 ML by applying CO pressures up to 1 mbar. The fraction of CO molecules adsorbed at terminal and bridge sites on Ni(100) at a fixed temperature depends strongly on the total CO coverage. The variation of the adsorption site occupancy with coverage is well reproduced by a lattice-gas model which takes into account the lateral interaction of the adsorbed molecules.