Identification of oxygen species on single crystal K(110)

A. P. Baddorf; B. S. Itchkawitz

doi:10.1016/0039-6028(92)90166-4

Identification of oxygen species on single crystal K(110)

A. P. Baddorf, B. S. Itchkawitz

Scanning Tunneling Microscopy Group

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10 Scopus citations

Abstract

The interaction of oxygen with a single-crystal K(110) surface has been studied using HREELS, XPS, and LEED. Vibrational spectroscopy reveals that at 88 K oxygen is initially chemisorbed dissociatively. Higher exposures lead to occupation of subsurface sites and formation of a bulk K₂O oxide. In contrast with the interpretations of previous photoemission experiments, no molecular species were observed. Oxygen is transferred from surface to subsurface sites when the sample is annealed to 240 K, or when the surface is irradiated by AlKα X-rays. The latter appears to be a direct photochemical process. Even with both chemisorbed and oxide species present, the surface remains reactive. No long-range order was observed after oxygen adsorption.

Original language	English
Pages (from-to)	73-80
Number of pages	8
Journal	Surface Science
Volume	264
Issue number	1-2
DOIs	https://doi.org/10.1016/0039-6028(92)90166-4
State	Published - Mar 1 1992

Funding

We would like to thank David Zehner for comments and discussions. Research at ORNL was sponsored by the Division of Materials Science, US Department of Energy, under contract DE-ACO5840R21400 with Martin Marietta Energy Systems, Inc. This work was also supported by the US National Science Foundation (NSF) under Grant No. DMR-86-10491.

Funders	Funder number
Division of Materials Science
US Department of Energy	DE-ACO5840R21400
US National Science Foundation
National Science Foundation

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AB - The interaction of oxygen with a single-crystal K(110) surface has been studied using HREELS, XPS, and LEED. Vibrational spectroscopy reveals that at 88 K oxygen is initially chemisorbed dissociatively. Higher exposures lead to occupation of subsurface sites and formation of a bulk K2O oxide. In contrast with the interpretations of previous photoemission experiments, no molecular species were observed. Oxygen is transferred from surface to subsurface sites when the sample is annealed to 240 K, or when the surface is irradiated by AlKα X-rays. The latter appears to be a direct photochemical process. Even with both chemisorbed and oxide species present, the surface remains reactive. No long-range order was observed after oxygen adsorption.

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Identification of oxygen species on single crystal K(110)

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