Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5424110 | Surface Science | 2009 | 5 Pages |
Abstract
The adsorption properties of CO on the epitaxial five-monolayer Co/Cu(1Â 0Â 0) system, where the Co overlayer has stabilized in the metastable fcc-phase, are reported. This system is known to exhibit metallic quantum well (MQW) states at energies 1Â eV or greater above the Fermi level, which may influence CO adsorption. The CO/fcc-Co/Cu(1Â 0Â 0) system was explored with low energy electron diffraction (LEED), inverse photoemission (IPE), reflection-absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TPD). Upon CO adsorption, a new feature is observed in IPE at 4.4Â eV above EF and is interpreted as the CO 2Ïâ level. When adsorbed at room temperature, TPD exhibits a CO desorption peak at â¼355Â K, while low temperature adsorption reveals additional binding configurations with TPD features at â¼220Â K and â¼265Â K. These TPD peak temperatures are correlated with different C-O stretch vibrational frequencies observed in the IR spectra. The adsorption properties of this surface are compared to those of the surfaces of single crystal hcp-Co, as well as other metastable thin film systems.
Keywords
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
L. Tskipuri, R.A. Bartynski,