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