Carbon monoxide adsorption on Ni(110) studied by infrared ellipsometric spectroscopy

• Published in: Surface science Vol. 97; no. 2; pp. 377 - 392
• Main Authors: Mahaffy, P.R., Dignam, M.J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.1980
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(80)90674-3

CO adsorption on Ni(110) was studied over a wide pressure and temperature range by infrared ellipsometric spectroscopy. A band resolution analysis has led ta an interpretation or reinterpretation of previous LEED work. The following picture of the sequence of surface stuctures occurring with increasing CO coverages emerges. (a) At low coverages, CO enters short bridge sites on the Ni(110) ridges up to one half coverage corresponding to a c(2 × 2) structure. (b) Further increase in coverage leads to structures with no long range order with CO molecules occupying both linear and short bridge sites. (c) This is followed by one-dimensional compressional structures with CO restricted to ridge positions. (d) Finally a bucketed (1 × 1) or distorted c(2 × 1) overlayer structure forms with CO molecules in near linear and near long-bridge sites.