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Narrow UV photoemission lines from graphite

Thiagarajan, Balasubramanian LU ; Kihlgren, T ; Wallden, L and Yakimova, R (2002) Proceedings of 7th International Conference on Nanometer-Scale Science and Technology and 21st European Conference on Surface Science (NANO-7/ECOSS-21)
Abstract
Stimulated by the recent observation by LEED that well ordered graphite overlayers may be prepared by heating SiC crystals [1] we have used LEED, STM and UPS (hv = 20-140 eV) to study such layers and compared the photoemission spectra to those we obtain from a natural single crystal. Two results are of particular interest. One is that the overlayers give spectra having a quality well on par with those from the natural crystal. This means that the overlayers can be attractive as an alternative to natural crystals, which are inconveniently small for many experiments. The other result is that there are graphite states, which give quite narrow emission lines. One is due to the upper σ state at Γ and another to states near the Fermi level,... (More)
Stimulated by the recent observation by LEED that well ordered graphite overlayers may be prepared by heating SiC crystals [1] we have used LEED, STM and UPS (hv = 20-140 eV) to study such layers and compared the photoemission spectra to those we obtain from a natural single crystal. Two results are of particular interest. One is that the overlayers give spectra having a quality well on par with those from the natural crystal. This means that the overlayers can be attractive as an alternative to natural crystals, which are inconveniently small for many experiments. The other result is that there are graphite states, which give quite narrow emission lines. One is due to the upper σ state at Γ and another to states near the Fermi level, which for graphite means states at the zone corners. Both lines should be useful for ador absorption studies as an alternative to the C 1s core line and the σ line may provide testing ground for the current modeling of excitation lifetimes in graphite. (Less)
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author
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
narrow emission lines, graphite states, natural single crystal, photoemission spectra, STM, UPS, heating SiC crystals, ordered graphite overlayers, LEED, UV photoemission lines, graphite, Fermi level, zone corners, absorption, adsorption, excitation lifetimes, C
host publication
7th International Conference on Nanometer-Scale Science andTechnology and 21st European Conference on Surface Science
pages
2 pages
publisher
Lund University
conference name
Proceedings of 7th International Conference on Nanometer-Scale Science and Technology and 21st European Conference on Surface Science (NANO-7/ECOSS-21)
conference location
Malmö, Sweden
conference dates
2002-06-24 - 2002-06-28
language
English
LU publication?
yes
id
5122023f-5fad-48f6-b17d-2afe233ff60b (old id 611042)
date added to LUP
2016-04-04 11:38:54
date last changed
2022-02-14 16:23:31
@inproceedings{5122023f-5fad-48f6-b17d-2afe233ff60b,
  abstract     = {{Stimulated by the recent observation by LEED that well ordered graphite overlayers may be prepared by heating SiC crystals [1] we have used LEED, STM and UPS (hv = 20-140 eV) to study such layers and compared the photoemission spectra to those we obtain from a natural single crystal. Two results are of particular interest. One is that the overlayers give spectra having a quality well on par with those from the natural crystal. This means that the overlayers can be attractive as an alternative to natural crystals, which are inconveniently small for many experiments. The other result is that there are graphite states, which give quite narrow emission lines. One is due to the upper σ state at Γ and another to states near the Fermi level, which for graphite means states at the zone corners. Both lines should be useful for ador absorption studies as an alternative to the C 1s core line and the σ line may provide testing ground for the current modeling of excitation lifetimes in graphite.}},
  author       = {{Thiagarajan, Balasubramanian and Kihlgren, T and Wallden, L and Yakimova, R}},
  booktitle    = {{7th International Conference on Nanometer-Scale Science andTechnology and 21st European Conference on Surface Science}},
  keywords     = {{narrow emission lines; graphite states; natural single crystal; photoemission spectra; STM; UPS; heating SiC crystals; ordered graphite overlayers; LEED; UV photoemission lines; graphite; Fermi level; zone corners; absorption; adsorption; excitation lifetimes; C}},
  language     = {{eng}},
  publisher    = {{Lund University}},
  title        = {{Narrow UV photoemission lines from graphite}},
  year         = {{2002}},
}