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Adsorption of Oxygen on Potassium- and Barium-dosed Au Surfaces:X-Ray Photoelectron and Ultraviolet Photoelectron Spectroscopy Studies

Ayyoob, Mohammed and Hegde, Manjanath S (1990) Adsorption of Oxygen on Potassium- and Barium-dosed Au Surfaces:X-Ray Photoelectron and Ultraviolet Photoelectron Spectroscopy Studies. In: Journal of Chemical Society, 86 (10). pp. 1893-1898.

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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 $O^2_2-(ad)$ and the ionic species 0-(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. $0^-$(ad) species associated with the alkali metal is characterised by O (1s) at 531 eV and 0 (2p) at 8.5 and 11 eV. A small amount of $0^2$- (oxidic) oxygen is also seen at low alkali-metal coverages at 300 K with 0 (1s) at 529.5 eV and O (2p) at 4.8 eV. $0^2_2$- is stable below 150 K and $O^-$ and $0^{2-}$ 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.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Royal Society of Chemistry
Keywords: XPS and UPS studies;potassium;barium;alkali-metal;
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Srinivasa Naika
Date Deposited: 27 Nov 2007
Last Modified: 19 Sep 2010 04:41
URI: http://eprints.iisc.ac.in/id/eprint/12637

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