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Bias-dependent scanning tunneling microscopy study of the oxygen-adsorbed Si(111)-(7×7) surface: Observation of metastable molecular oxygen
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Surface and Semiconductor Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Surface and Semiconductor Physics. Linköping University, The Institute of Technology.
2002 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 65, no 15, 155305- p.Article in journal (Refereed) Published
Abstract [en]

We have observed the initial stage of oxygen adsorption on a Si(111)-(7×7) surface using scanning tunneling microscopy. Among the bright sites observed after exposing the surface to oxygen in occupied state images, there are differences in the bias dependence of the brightness. Taking into account the local density of states of the oxygen-adsorbed Si(111)-(7×7) surface, we conclude that the sites appearing brightly only with a tip bias of >~+2.1 V are the molecular oxygen. The preferred adsorption site of this molecular species is a corner adatom, which has an oxygen atom adsorbed into its backbond, of the faulted half of the (7×7) unit cell.

Place, publisher, year, edition, pages
2002. Vol. 65, no 15, 155305- p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47885DOI: 10.1103/PhysRevB.65.155305ISI: 000175147100078OAI: oai:DiVA.org:liu-47885DiVA: diva2:268781
Available from: 2013-03-27 Created: 2009-10-11 Last updated: 2013-03-27Bibliographically approved

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Hansson, GöranUhrberg, Roger

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