A FTIRAS Study of CO Adsorbed At Ni(100) Surfaces

Document Type


Subject Area(s)

Engineering, Chemical Engineering, Catalysis and Reaction Engineering, Physical Sciences and Mathematics, Engineering Physics


Adsorption of CO at Ni(100) surfaces has been studied with Fourier-Transform Infrared Absorption-Reflection (FTIRA) spectroscopy in the temperature range 121 K to 350 K. Up to a coverage of θ = 0.5 top site and bridge site bonded CO has been identified by absorption peaks in the frequency range 2016 to 2048 cm−1 and 1885 to 1949 cm−1, respectively. The site population is temperature dependent, top sites are preferred at high temperatures, bridge sites at low temperatures. Towards the saturation coverage, θ ≈︁ 0.67 the top site peak is replaced by a broad absorption structure between 2000 and 2100 cm−1, which contains at least 3 separate peaks. The bridge site related absorption remains a single peak but shifts upwards by 20 cm−1 to 1968 cm−1. This suggests that above a coverage of θ = 0.5 CO molecules are arranged in an incommensurate adsorption structure, in which a unique top adsorption site does no longer exist.

Digital Object Identifier (DOI)

APA Citation

Lauterbach, A.J., Wittmann, M., Küppers, J. (1993). A FTIRAS study of CO adsorbed at Ni(100) surfaces. Berichte der Bunsengesellschaft für Physikalische Chemie, 97(3), 326-328.