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- Hellsing, BChalmers University of Technology (author)
Photoinduced desorption of potassium atoms from graphite
- Article/chapterEnglish1996
Publisher, publication year, extent ...
- Elsevier BV,1996
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:uu-235941
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-235941URI
- https://doi.org/10.1016/0039-6028(96)00144-6DOI
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- Language:English
- Summary in:English
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- SwePubSwePub
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Notes
- We present an experimental and theoretical investigation of desorption of potassium atoms from the basal plane of graphite induced by photons with energies from 2 to 6 eV. The intensity of the photon flux employed in the measurements is low, and the observed photodesorption is a single-photon, non-thermal event. At monolayer coverage the photon-energy dependence of the cross section has a maximum at 4.8 eV. The experimental observations are interpreted in terms of a hot carrier mechanism, which involves attachment of optically excited substrate hot electrons to the empty 4s state of ionized potassium, and then desorption. The theory predicts a Gaussian line shape of the photoyield versus photon energy. Fitting the model parameters to the experimental data, we determine: (i) the potential energy for Gr + K+ and Gr + K-0; and (ii) the position (2.4 eV above the Fermi level) and width (0.15 eV) of the potassium 4s resonance, which is in good agreement with independent experimental observations.
Subject headings and genre
- NATURVETENSKAP Fysik Annan fysik hsv//swe
- NATURAL SCIENCES Physical Sciences Other Physics Topics hsv//eng
- electron-solid interactions
- scattering
- diffraction
- graphite
- photochemistry
- photon stimulated desorption
- semiempirical models and model calculations
- surface photochemistry
Added entries (persons, corporate bodies, meetings, titles ...)
- Chakarov, D VChalmers University of Technology (author)
- Österlund, Lars,1967-Uppsala universitet,Fasta tillståndets fysik(Swepub:uu)laros288 (author)
- Zhdanov, V PChalmers 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:Surface Science: Elsevier BV363:1-3, s. 247-2510039-60281879-2758
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