Electron spectroscopic studies of oxygen and carbon dioxide adsorbed on metal surfaces

Vishnu Kamath, P. ; Rao, C. N. R. (1984) Electron spectroscopic studies of oxygen and carbon dioxide adsorbed on metal surfaces Journal of Physical Chemistry, 88 (3). pp. 464-469. ISSN 0022-3654

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Official URL: http://pubs.acs.org/doi/abs/10.1021/j150647a028

Related URL: http://dx.doi.org/10.1021/j150647a028

Abstract

Adsorption of oxygen on Ni, Cu, Pd, Ag, and Au surfaces has been investigated by employing UV and X-ray photoelectron spectrscopy as well as electron energy loss spectroscopy (EELS). Molecularly chemisorbed (singlet) oxygen is found on Ni, Cu, Ag, and Au surfaces showing features such as stabilization of the rB orbital, destabilization of the .nu orbital, higher O(1s) binding energy than the atomic species, and a band 2-3 eV below the Fermi level due to metal d-O(2p)u interaction. 0-0 and metal-oxygen stretching frequencies have been observed in EELS. Physical adsorption of O2 is found to occur on Pd and Ni surfaces, only at high exposures in the latter case. Physical adsorption and multilayer condensation of CO, on metal surfaces are distinguished by characteristic relaxation shifts in UPS as well as O(1s) binding energies. Adsorption of CO on a Ni surface covered with presorbed atomic oxygen gives rise to CO2.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:43512
Deposited On:11 Jun 2011 14:07
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