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- Chakarov, D VChalmers University of Technology (author)
Photos induced desorption and intercalation of potassium atoms deposited on graphite(0001)
- Article/chapterEnglish1996
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- 1996
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- LIBRIS-ID:oai:DiVA.org:uu-235940
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-235940URI
- https://doi.org/10.1016/S0169-4332(96)00410-2DOI
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- Language:English
- Summary in:English
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- 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.
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- Österlund, Lars,1967-Uppsala universitet,Fasta tillståndets fysik(Swepub:uu)laros288 (author)
- Hellsing, BChalmers University of Technology (author)
- Kasemo, BChalmers University of Technology (author)
- Chalmers University of TechnologyFasta tillståndets fysik (creator_code:org_t)
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- In:Applied Surface Science106, s. 186-1920169-43321873-5584
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