Adsorption of oxygen on potassium- and barium-dosed au surfaces: X-ray photoelectron and ultraviolet photoelectron spectroscopy studies
- 1 January 1990
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 86 (10) , 1893-1898
- https://doi.org/10.1039/ft9908601893
Abstract
XPS and UPS studies on potassium- and barium-covered Au surfaces show increased adsorption of oxygen relative to that on clean gold. Below 150 K, the peroxide species O2– 2(ad) and the ionic species O–(ad) are seen. The peroxide species is characterised by an O (1s) peak at 533 eV and O (2p) bands at 6.4, 9.2 and 12.1 eV. O–(ad) species associated with the alkali metal is characterised by O (1s) at 531 eV and O (2p) at 8.5 and 11 eV. A small amount of O2–(oxidic) oxygen is also seen at low alkali-metal coverages at 300 K with O (1s) at 529.5 eV and O (2p) at 4.8 eV. O2– 2 is stable below 150 K and O– and O2– are stable up to 500 K. Intermixing of the surface Au layers with a K adlayer is indicated with possible diffusion of K into the subsurface region.Keywords
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