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Photos induced desorption and intercalation of potassium atoms deposited on graphite(0001)
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.
1996 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 106, 186-192 p.Article in journal (Refereed) Published
Abstract [en]

In addition to the photodesorption phenomenon previously observed for single K atoms from a graphite surface covered with a monolayer of potassium we present new results related to the photon stimulated interaction of potassium with graphite, which concerns alternative routes for energy relaxation of the photo excited K adatoms: photoinduced intercalation. The desorption yield has a threshold at h omega approximate to 3 eV and a maximum at h omega(max) approximate to 4.9 eV, Polarization measurements indicate a substrate-mediated mechanism. The coverage dependence suggests that only the ionic 2D, K-phase is photo active. The proposed mechanism includes attachment of photo-generated hot electrons to the K 4s adsorbate resonance of energy E(res). Assuming an analogous excitation process we discuss different mechanisms for the K photo intercalation and possible applications of the photon stimulated doping of carboneous materials at low temperature.

Place, publisher, year, edition, pages
1996. Vol. 106, 186-192 p.
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Other Physics Topics
URN: urn:nbn:se:uu:diva-235940DOI: 10.1016/S0169-4332(96)00410-2ISI: A1996VT40700031OAI: oai:DiVA.org:uu-235940DiVA: diva2:762467
2nd International Conference on Photo-Excited Processes and Applications, SEP 17-21, 1995, JERUSALEM, ISRAEL
Available from: 2014-11-11 Created: 2014-11-11 Last updated: 2014-11-11

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