Abstract
Infrared spectra of carbon monoxide adsorbed on highly oriented pyrolytic graphite (HOPG) have been measured for the first time. It turned out from both theoretical considerations and measurements that highest sensitivity is achieved under almost grazing incidence with the light polarized parallel to the plane of incidence. Thus graphite behaves similar to a metal. At low coverage CO gives rise to a single absorption band slightly redshifted with respect to the corresponding gas frequency, the band width at full monolayer coverage being 0.8 cm −1. At higher coverage band splittings and band shifts occur. Isotherms measured by FT-IR-spectroscopy at temperatures below 35 K show significant steps indicating a two-dimensional phase transition. Preliminary results of FT-IR-investigations of nitric oxide adsorbed on HOPG are presented.
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