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Photos induced deso...
Photos induced desorption and intercalation of potassium atoms deposited on graphite(0001)
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- Chakarov, D V (författare)
- Chalmers University of Technology
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- Österlund, Lars, 1967- (författare)
- Uppsala universitet,Fasta tillståndets fysik
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- Hellsing, B (författare)
- Chalmers University of Technology
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- Kasemo, B (författare)
- Chalmers University of Technology
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(creator_code:org_t)
- 1996
- 1996
- Engelska.
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Ingår i: Applied Surface Science. - 0169-4332 .- 1873-5584. ; 106, s. 186-192
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
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