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A FT-RAIRS investigation of the nature of the 3-fold bridge-CO species on Ni(111)

Authors
Journal
Surface Science Letters
0167-2584
Publisher
Elsevier
Publication Date
Volume
223
Identifiers
DOI: 10.1016/0167-2584(89)90660-9
Disciplines
  • Physics

Abstract

Abstract The adsorption of CO on Ni(111) in the low CO-coverage regime (θ CO ≲ 0.07 ML) has been investigated using FT-reflection absorption infrared spectroscopy. The FT-RAIRS results reported here provide a clear experimental evidence that at 85 K CO molecules occupy only the 3-fold bridge sites at low CO coverages. The population of the 2-fold bridge sites occurs only at higher CO coverages. In addition, the extended frequency range and the enhanced sensitivity of the FT-RAIR technique allows us to detect three types of 3-fold bridge v(CO) modes observed at 1815–1822, 1804–1808, and 1793–1799 cm -1, respectively. Possible origins of these v(CO) modes have also been postulated.

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