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PHOTOSTIMULATED DESORPTION OF METAL ADATOMS - POTASSIUM ON GRAPHITE
Chalmers University of Technology.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Chalmers University of Technology.
Chalmers University of Technology.
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1994 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 311, no 3, L724-L730 p.Article in journal, Letter (Refereed) Published
Abstract [en]

Photodesorption is observed of single K atoms from a graphite surface covered with less than 1 monolayer of potassium. The desorption cross section has a threshold at homegaBAR almost-equal-to 3 eV and a maximum at homega(max)BAR almost-equal-to 4.9 eV. Polarization measurements indicate a substrate-mediated mechanism. The coverage dependence suggests that only the ionic 2D, K-phase is photoactive. The proposed mechanism includes attachment of hot electrons, photoexcited in the bulk, to the K4s adsorbate resonance of energy E(res). The band structure of graphite causes a narrow energy distribution of hot electrons, which yields homega(max)BAR almost-equal-to 2E(res).

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1994. Vol. 311, no 3, L724-L730 p.
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URN: urn:nbn:se:uu:diva-235946DOI: 10.1016/0039-6028(94)91416-8ISI: A1994NM72600006OAI: oai:DiVA.org:uu-235946DiVA: diva2:762471
Available from: 2014-11-11 Created: 2014-11-11 Last updated: 2017-12-05

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Österlund, Lars

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