PHOTOSTIMULATED DESORPTION OF METAL ADATOMS - POTASSIUM ON GRAPHITE
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
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).
Place, publisher, year, edition, pages
1994. Vol. 311, no 3, L724-L730 p.
Other Physics Topics
IdentifiersURN: urn:nbn:se:uu:diva-235946DOI: 10.1016/0039-6028(94)91416-8ISI: A1994NM72600006OAI: oai:DiVA.org:uu-235946DiVA: diva2:762471